Unfair Service from ADT

In October of 2024 I had an issue with my alarm system in which I have contacted ADT technical department to book a call out to sort my system out, the technician came out and assessed the system and left, I never hear from him or ADT ever since, I have been calling adt every month that passed afterwards and their call centre agents in every department doesn't give a ****, they would say that they transferring me to another department and the line would drop a long with insisting I have received a quote which I have never received nor can they provide proof of that, or they say that they would follow up and then I don't hear anything after that. Eventually I sent a letter to cancel and requested for a refund for all those months in which I was declined because the system was still online. In Jan 2025 it went completely dead so they agreed to credit Jan and Feb, I have canceled since then but just yesterday they debit my account again. I have spoken to the Branch manager in Midrand and he said that I have to pay because its a notice period I have to serve why should I pay for a service I am not receiving or haven't been receiving?