ADT Security Services review: Customer service lies

I moved out of state, still had time on my contract. I called to settle up, and was told that I could take a new contract and have my old balance written off. I have monitored the account and weekly I reached out to ask when the balance would be removed. They say each time, 30 days. Now they have charged the balance (over $500) to my credit card. I have initiated 3 chats and three phone calls. Each time they assure me it is being taken care of. It has been more than 6 weeks that I have been fighting this. In the mean time, they are also taking the monthly charge for the new service. What a rip-off.