Im just writing this in English because im so frustrated to even contemplate to write in German. 



It has to do with my contract termination.



At mid February 2018 I go to o2 store and i tell them i want to cancel my contract at March 31st. I planned to leave Germany at that very day and did not want my contract to run further that date. The store representative gave me a form and we filled the details together. I get the form and send to o2 that day.



March 31st is my last in Germany and I sent the modem back, just as i was supposed to. 



On April I receive billing. I find this weird and i send them emails to kundendservice but get no reply. Remeber, Im not in Germany and cannot promptly call them. I figure its a mistake and move on



Come June/July, Im always on the move (USA, Canada) and still keep receiving bills. 



What is going on?



I chatted with one sales rep online on July who tells me that they haven't received a letter of cancellation but they received my modem. I tell them that i did not have an undelivered mail from Feb to March 31st. They tell me to send another informal cancellation letter by express mail (see confirmation attached) which i did deliver on July 4th and explicitly stated to confirm me by email when they receive it.



Can you please cancel my contract already? I have not been using your service from April 1st and I keep receiving bills.  It is not fair that I pay for this.



Best Regards