ADT gives me headaches!

For a year now I am no longer a client of yours, I get SMS's all the time saying I must pay my account or else I will lose my access to credit! When I cancelled my service with ADT I was in credit and they scheduled a refund to me. Now I must pay my account! After a year I am still not relieved from ADT, a company that was suppose to protect me but when I told the Manager that their people held a gatherings at 02:30 in the night 5m from my home and it was just swept under the carpet. I was just on the phone again with the credit controller and she just said she can't do anything for me! Absolute pathetic service!!!!