Hi,
I have moved away from Germany in September and cancelled the o2 contract beforehand. As i have cancelled earlier than the contract period, I have already paid the contract 3 extra month till November 2020. Before I moved out, I sent a written cancellation by post, returned the router and also provided the Abmeldung document via fax. I have called the hotlines at least 5 times to confirm my cancellation and the rude staff just answered "it's done!"without sending any written confirmation by mail or email. Today I got a "final notice" from o2 asking me to pay 120€!?