Disgusting service

MTN has been double charging me on my contract since December 2019 for a promotion fee i never signed up for. My contract line gets suspended every month even though payments are up to date. I have logged over 10 queries and no one cares to resolve the issue. Each time I phone the call centre to get the issue resolved no one actually helps and I hold on for ages, over 30min at a time with no one answering the phone. I get bounced from the call centre, to legal department to credit controller to finance department and non of these people can assist. Each time a different reason for my line being suspended is given and no one actually resolves the issue. I am still being charged (R1019)for a contract which is supposed to be R569. The service is disgusting.