ADT no payment for Non-service delivery

I joined ADT on a month to month contract, and it was written on my contract, I decided to cancel due to non service, I reported a technical issue before cancellation this was in August 2022 but no technician has ever came, I ended up not paying the following months there after and they would call me and I would tell them that I have decided to cancel my contract due to no one attending the technical issue that I'm experiencing they said they will send a technician, on the call I tell them that no I'm canceling mind you they now calling every month to say I must pay but I keep on telling them that no I've cancelled due to non service, then I get a call that I will be handed over cause I'm not paying and I'm telling them that I've cancelled in September why are they calling me they say I did not cancel the proper way, I'm like how cause when I spoke to the consultant the said they will cancel and they are looking into my contract as it is a month to month and i must pay for the month of august. Now some rude Indian guy... apologies for labeling , but this guy threatens me and say I signed a contract and if I don't pay they will send their lawyers to me , but services were not delivered why must I pay for the months that no service was delivered isn't it also part of the contract... Who represents us when they don't deliver services..