Why never to accept a mobile sales contract with MTN

You haven’t experienced bad service until you have entered into a contract with MTN via their mobile sales departments. Received a telemarketing call late in 2018 which promised an additional 2GB per month for R89. Didn’t receive any followup until 6 months later when I noticed additional charges on my account, without me having received any additional data in return. Went to 3 different MTN branches IN PERSON on multiple occasions, made multiple calls to the help line and ... NOTHING. Nobody knew what was going on with the contract or how to revise the incorrect charges. I’ve made peace with it now - following up is obviously useless. can’t wait until my contract expires. Steer clear of this customer trap