Alarm system

Good evening, my alarm system is not working since last year October 2025. I have tried to raise the matter to account team department with no help. I have been charged for the product that is not working. Alarm system and battery is dead. I have sent the email to different people from that department. I can't pay service that's is not rendered. I have spoken to Mr Bongani M, Sent email to the following people. Miss Mpho M, Miss Musa Mahlangu, and Mr Ryder to escalate the matter to management department. I have tried and sent the cancellation letter. Please help!!!