I signed up a DSL contract last week (27.04.2020) for my new apartment.
Unfortunately, when I moved in on 01.05.2020 my landlord informed me that there is an existing connection in place and therefore I need to terminate the contract.
I already sent my written termination letter to the Hamburg address as well as that of Nuremberg last Saturday.
1. Is sending the letter sufficient for the termination?
2. If Yes, how do I know the contract have been terminated.
3. If No, what else do I need to do?
Thanks