I am a german agm investor and i accepted the takeover offer in...

I am a german agm investor and i accepted the takeover offer in february. since then i am waiting for my money. the shares were blocked for sale at the berlin stock exchange when i agreed to accept the offer.
i asked my german bank, but they had no further information.
had anybody the same problems as i.
what can i do to get my money.
thank you for your help.
best greetings from munich/germany.
Walter