What obligation does a data controller or processor have after appointing a data protection officer?

If a data subject puts a complaint before a DPA and receives no information about its progress or outcome, how long does the data subject have to wait before taking action in the courts?

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Due to rapidly expanding workforce, Company A has decided to outsource its payroll function to Company B. Company B is an established payroll service provider with a sizable client base and a solid reputation in the industry.
Company B's payroll solution for Company A relies on the collection of time and attendance data obtained via a biometric entry system installed in each of Company A's factories. Company B won't hold any biometric data itself, but the related data will be uploaded to Company B's UK servers and used to provide the payroll service. Company B's live systems will contain the following information for each of Company A's employees:
Name
Address
Date of Birth
Payroll number
National Insurance number
Sick pay entitlement
Maternity/paternity pay entitlement
Holiday entitlement
Pension and benefits contributions
Trade union contributions
Jenny is the compliance officer at Company A. She first considers whether Company A needs to carry out a data protection impact assessment in relation to the new time and attendance system, but isn't sure whether or not this is required.
Jenny does know, however, that under the GDPR there must be a formal written agreement requiring Company B to use the time and attendance data only for the purpose of providing the payroll service, and to apply appropriate technical and organizational security measures for safeguarding the data. Jenny suggests that Company B obtain advice from its data protection officer. The company doesn't have a DPO but agrees, in the interest of finalizing the contract, to sign up for the provisions in full. Company A enters into the contract.
Weeks later, while still under contract with Company A, Company B embarks upon a separate project meant to enhance the functionality of its payroll service, and engages Company C to help. Company C agrees to extract all personal data from Company B's live systems in order to create a new database for Company B.
This database will be stored in a test environment hosted on Company C's U.S. server. The two companies agree not to include any data processing provisions in their services agreement, as data is only being used for IT testing purposes.
Unfortunately, Company C's U.S. server is only protected by an outdated IT security system, and suffers a cyber security incident soon after Company C begins work on the project. As a result, data relating to Company A's employees is visible to anyone visiting Company C's website. Company A is unaware of this until Jenny receives a letter from the supervisory authority in connection with the investigation that ensues. As soon as Jenny is made aware of the breach, she notifies all affected employees.
The GDPR requires sufficient guarantees of a company's ability to implement adequate technical and organizational measures. What would be the most realistic way that Company B could have fulfilled this requirement?

A private company has establishments in France, Poland, the United Kingdom, and most prominently, Germany, where its headquarters is established. The company offers its services worldwide. Most of the services are designed in Germany and supported in the other establishments. However, one of the services, a Software as a Service (SaaS) application, was defined and implemented by the Polish establishment. It is also supported by the other establishments.
What is the lead supervisory authority for the SaaS service?

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Jane Stan's her new role as a Data Protection Officer (DPO) at a Malta-based company that allows anyone to buy and sell cryptocurrencies via its online platform. The company stores and processes the personal data of its customers in a dedicated data center located in Malta (EU).
People wishing to trade cryptocurrencies are required to open an online account on the platform. They then must successfully pass a KYC due diligence procedure aimed at preventing money laundering and ensuring compliance with applicable financial regulations.
The non-European customers are also required to waive all their GDPR rights by reading a disclaimer written in bold and belong a checkbox on a separate page in order to get their account approved on the platform.
The customers must likewise accept the terms of service of the platform. The terms of service also include a privacy policy section, saying, among other things, that if a Are the cybersecurity assessors required to sign a data processing agreement with the company in order to comply with the GDPR''