bad accounting and billing practices

When I first concluded my contract with ADT, I was given an account number by the service agent. Each time I make a payment into the account it is not noted. I paid the ADT account for service rendered in Oct 2015 and ADT debits my account without authorisation in Jan 2016. I do not know whose account details these are. I was given the details by ADT sales agent /representatives as an ADT account. ADT's representative has put forward information which has prejudiced me on more than one occasion. Perhaps it is time to lay a charge of ***** against the sale agent and ADT as a company, as I cannot get the persons name on the account due to banker/client confidentiality and cannot retrieve the funds paid into the account. ADT subsequently debited my account and when I tried calling to indicate I paid already and discussed it with a previous agent I could not get through.