Cannot change get rid of Voice Mail Lite

I cannot get rid of Voice Mail Lite. Despite numerous attempts including attempted research on MTN's website (forget ever getting anything useful on that godawful site) and calling the help center (no one can help), MTN continues to insist on a service I never asked for and have never activated. AND then has the audacity to inform me that I am on standard voice mail when attempting to change settings. I am not surprised considering the huge amount of effort to get anything done with MTN, pretty much ever. But I am frustrated, as usual. Just make your systems work!