Bad service

Hi there, after canceling my wifi contract with Telekom and receiving a reference my account was only closed after 2 month and then I was charged cancelation fees even though I paid my account before debit order date. The call center is no help as you have to stay on the line so long just to be told it's the wrong department. After numerous mails also no response. If they did there jobs then problems would not exculate so far. I have been struggling with my account since April.