Billing for nonexistent service

Since the 3rd week of October , I’ve had no service - not able to call or receive calls . Their customer care line tells you high call volume, email or contact them via their contact page. I’ve had no response despite the auto response acknowledging receipt. The contract has run its time and I am sick of paying for a service that I do not have and wasting money callling a call centre. I would not recommend their products as there’s no customer service or even provision of contracted services