Resolve Bank Issues in Germany

I am currently dealing with notable challenges related to my bank account in Germany. Despite my account being active, I am unable to transact any business. Specifically, my cards are not functioning, I can't send or receive money. Sever attempts to reach out to my bank for clarification or possible resolution have been futile, with no response or justification given.

Ideal candidate for this task ought to exhibit solid experience in banking law, preferably within the German legal context. A background in resolving banking disputes or matters relating to transaction hitches will be a plus. Fluent understanding and communication in both English and German languages is necessary for seamless interpretation and representation.