MTN keeps taking my money and providing no service

I have been a loyal client of MTNs for over five years on contract. I have been having ongoing difficulty with making and receiving calls (dropped calls) , no network, no data connection since December 2019. I completed a complaints from on the MTNs network coverage online page. MTN had decided that that they will install a booster at my residence . I completed the paper work and sent to them. Ever since that I never heard from them and the problem still persists. I cannot continue paying R1700 per month for a service that MTN cannot provide. I am extremely frustrated and unhappy with the way my complaint has been handled. I have put a stop of payment to MTN as of 1 April 2020. I am paying for nothing. I intend referring my complaint to ICASA and the consumer protection commission. I am so unsatisfied with their service that I have decided that I want my three contacts to be cancelled immediately. I will not be held liable for any further costs as MTN has failed hopelessly in trying to remedy the problem. I have numerous communication via email and Facebook posts detailing how i tried to get MTN to help me but they just ignored me. I cannot be held at ransom to continue paying for a service I am not receiving.