Worst service!!!

Worst service ever

I've sent a request to cancel my request in August and one of the consultant contacted me and confirmed it has been canceled. I asked if there were to be any cancelation fees and she confirmed that the last installment was the one for August as it was a month to month contract.

2 months later I receive a credit report that the account is in arrears and that I missed the September debit order.I contacted Adt and the agent could give a valid reason why the account is owing. She advised that someone from credit will call me back and 2 weeks later I am still waiting.

Can someone from ADT PLEASE FIX THIS as this is affecting by credit profile badly.