No Customer Service

I did a sim swap a few weeks ago and since then I get adverti*****ts after each call. I contacted the call centre five times and it’s like no one knows how to switch the adverti*****ts off. I went to MTN Savannah Mall and same, no one has any idea what to do or who to call to fix my problem. The guy at MTN did try to call MTN contract department but after he had to call back for the third time and them failing to put the call through to the correct department he just gave up and told me it will be fixed in 24 hours without him doing anything. I asked the gentleman if he maybe located the problem but he couldn’t answer me he just said I must wait 24 hours. Obviously my problem is not fixed and MTN clearly doesn’t know what to do. That is extremely annoying and actually laughable at the same time to see a big company like MTN not even able to assist customers with basic and simple problems.