Incorrect amount debited

During the end of March 2024, I received a call from an MTN consultant advising that my month to month contract will be ending end of the month and therefore, she wants to offer me a promotion to upgrade the contract. I’ve initially clearly stated that I’m not interested, she however went on and advised me that the deal she has for me is alot less for more minutes and data. According to her, if I remember correctly, the new contract amount would be +|- R205 per month. This was to good to be true for me so I confirm numerous times during the call that it will be the total contract amount and that the contract will be capped and cannot go above that amount. She confirmed that it is correct. I’ve proceeded with the upgrade but not one after the upgrade was the agreed amount deducted. This month’s statement is R474.04 which was NEVER the amount I agreed to this is also not less than my previous contact amount!!!! I have also not received my contract to date!!!