First some background: I am an Indian and I am studying in Germany. I live in a student dorm. The first time I moved into the dorm I received a letter saying I have to pay the ARD ZDF contribution of 17.50 euros. Since my neighbour (a German resident) and I share a common entrance it was possible for me to simply give his number and share the payment with him. Now my neighbour left under some emergency conditions and a new person came in his place.
Now the question: My new neighbour and I both did not receive another letter from them asking for a contribution and neither of us has paid anything so far. I believe that my previous neighbour has forgotten to change his address or something like that. I have no way of contacting him since his disappearance was sort of mysterious. I would have expected them to send a letter to either of us to ask for the contribution after he left.
I have also lost the only letter they sent me (the first letter you get after registration at the Rathaus) which has the number on it. I am leaving Germany and returning to India permanently. I want to know how to take care of the deregistration so that they have nothing to trouble me with later on.
EDIT: Is there a way I can get my Beitragsnummer so that I can go through their website and cancel it?