Unhappy client

Good day I have been with Netstar for more than 4 years now, and recently i contacted them to inform them that my panic button is broken, and they have advised that my contract has expired already and if i want to renew I can do that and they will send someone to check my tracker and give me the new panic button. i have agreed for them to renew, but no one came to check the car or issue new panic button but have started with the debit orders. i am not happy with the service and tried to contact them with no luck, can they please fix this because i am not happy- ***