That would drive me nuts! How long have you had it? If you're in Germany, can't you return it under your EU consumer guarantees since the consumer has the right to return most items or cancel a service within 14 days? https://europa.eu/youreurope/business/dealing-with-customers/consumer-contracts-guarantees/consumer-guarantees/index_en.htm#:~:text=EU%20law%20also%20stipulates%20that,you%20to%20provide%20longer%20guarantees.
Given he shipped faulty goods, that might pressure him into repairing, replacing or refunding some money? Otherwise, I would be contacting my credit card company for quality and performance issues.
Downingtown, PA
Vancouver, BC
