Regret staying with ADT

Pathetic service received from ADT having been a client with them for almost 5 years. I am now on a month to month contract but its like they keep finding ways want me to leave. The summary of my situation was I was going to leave ADT last October because me monthly premiums increased to an amount I was not happy with and other companies could do my security for almost half the price. During my cancelation they called me to say they would not like to see me go and they can match my new monthly premium if I remain with them. I agreed, a decision I would regret everyday since, with my latest dispute being having agreed with 1 of the Technical managers Zac that a technical fee that was outstanding would be written off, as I've been overcharged as a client for an extended period, was not done. End of January a debit order for the amount went off and I called ADT to inform them that I will reverse this debit order as agreed with Zac, Zac called me a few days later to confirm it was incorrectly debited as it was already loaded and will not happen again. Just 2 weeks later I receive another email with the outstanding amount reflecting, between sending emails and calling the clueless call center I am not getting assistance to get write off the amount. I've never experienced such incompetence from a company and their staff.