Dear,

since I needed to leave Germany last month I have finished my contract through the website form (kündigung aus besonderen gründen > umzug ins ausland) and uploaded my Abmeldung.
I received an e-mail saying that I would receive a "cancellation confirmation by email or it would be mailed to me in the next 2-3 busines". However, I did not receive anything. I am no longer in Germany and I had to leave the router with a friend because I did not know what to do. 

I would appreciate if someone could help me here!