Don't use MTN Direct - Contract/Billing Issues

MTN direct sent me an sms promoting the latest Samsung S9+, I decided to sign up with their contract. The terms were R100 discount off the first year's monthly fee (it's a three year contract), it's basically been 6 months now where they are charging me that additional R100 per month. No one is able to send me the copy of my contract and they are just closing one ticket after another, with no hope of resolving the matter. I have sent a copy of the voice recording (when the deal was discussed and agreed to) and nobody is taking ownership. I strongly recommend consumers to look elsewhere as their client service is non existent.