Failure to get hold of mtn store for incorrect contract term

I performed a upgrade in December 2020 at mtn store 2 in Gateway. I opted for a tablet deal for 299 for 24 months as specified on the brochure for that month I was assisted by a consultant there and at the time I did the upgrade I was told that on the system the contract stated 299 for 36 months however she assured me that mtn is aware and that the contract is actually a 24 month contract and I would get that deal. To date my contract is 36 months. I tried calling mtn I was told the store needs to resolve the issue. I tried numerous times to contact the store with no success the phone just rings. I would have went there personally but here's the thing I do not live in Durban and I can't go there physically. I went to a stage where I sent someone to the store to get a number to contact them. I got the so called supervisor number Indrid who just told me that the person who assisted me was gonna call me which never happened I had to call then I was told that she is still waiting feedback. I been trying to call since my calls aren't taken I call the store the phone just rings this is absolutely horrible service from that store and very *****. I have failed all avenues and I'm forced to go to the store physically to get a response this is absolutely frustrating.