ADT Making up call outs to Charge excess Amounts

I regularly service my alarm, I had the ADT technician come out last year when this excessive billing was mentioned. He adjusted one of the beams and the problem was resolved. Until Feb 6 when I again got an sms about excessive billing I had a technician come out and he made adjustments. Then on 19 March I got an excessive alarm activity sms, which I queried and asked for details of the alleged call outs as I was not aware of the alarm going off excessively and the only day it went off was when the technician was testing the alarm, and I had informed the call centre of this. I do not believe I should be charged for call outs I didn't make, nor should I have my account debited when ADT is unable to provide an invoice or any evidence of call outs. <br> I asked for my debit order details to be removed on April 17th and was informed the request was sent to finance, I was provided with ADT bank details and made my payment, they still debited my account on May 3 and took off an additional amount without any invoice. I am further stuck with them until June 2016 as they only offer their services on a 3 year contract.