Poor services!!

I contacted ADT in May requesting to cancel my contract. I was informed that my contract only expired 15th of July but in this time i received a email notification the may monthly installment will be increasing on the 1st of July. <br> <br> I emailed the customer service manager stating my point how could i be paying the new installment price 1st of July if my contract is only expiring the 15th of July? A lady contacted me saying she would follow up on my complaint but she never contacted me again. Today the 2nd July i notice on my bank statement the new installment amount was debited. <br> <br> I am really disappoint with ADT, I feel like ADT was quick to take my money every month but when i truly had a problem no one could give me answers.