Horrific and stinking service by Cell C

I Have contract for over 16 yrs, I had the issue on Network connection since December 2020. I have sent complaints and spoken to the Technical team numerous times. No one from the Cell has been able to resolve the issue. I requested for refunds since they debit and charge every month for the service I am not receiving. No REFUND has been made. I then requested that they cancel the contract since they are unable to assist me or resolve the issue. They instead sent me Technical form to complete I dont why because their Technical guys are unable resolve this and they have been to my house and promised to propose to install a Booster. I am still waiting. They suggested I do SIM swop, now I am on the line with the Customer Service to do that SIM swop as suggested by them. To my surprise they telling I cannot do SIM swop on this number. I need call them from different. They always have excuses. I am now on hold for Team leader/Supervisor for over 30 minutes. I have had it with this company they must just cancel my contract.