I have sent a letter for cancellation of my O2 DSL contract on 05-Aug-2019 to following address but I have not received any email from o2. I have tried to send the documents also by fax but your fax isn't working. I have left Germany and for my it's impossible to send the documents again.
Telefonica Germany GmbH & Co. OHG
How can I know that the letter was received? and O2 contract is cancelled.
Lösung von o2_Katja
im happy that everything is fine now.