BAD SERVICE

I cancelled my contract with ADT in September 2015 and I have proof of this. After 5 months they still debited my cheque account on the 1 March 2016, with one months installment. I phoned and they advised me that they will came back to me, but up to date, no one made an effort to contract me. ADT send me emails telling me I am owning them since September, after cancellation letters and emails were sent by myself. I am very unhappy, and am totally feeling reassured that I made the decision to switch to another service provider.