Lying telesales man costing me R3305.87

First off the telesales gentleman made me believe he was phoning from MTN (he knew my contract details). He then proceeded to convince me that it was a special that MTN was running for long standing customers to have an uncapped package that will substitute my current contract (yes I know how it sounds now in retrospect) and that I will only have the one bill which will be less than my current contract with MTN. (his words and I confirmed that several times during our conversation before taking the deal) When the router arrived I went to MTN to confirm everything only to find out I was **** to and that I will now have an additional payment. I immediately cancelled the contract with MTN Umhlanga where I returned the UNOPENED package. I even went to the Rewardsco building in Umhlanga where I spoke with a Mr Prince who was very apologetic and said he will take care of the issue. Well the issue did not get taken care of as I was charged R1200 on the 1st of December, (I was busy with work so figured I’d take this as a lesson learned and sort it out once I have time. Well apparently I did not learn my lesson well enough as on 1/1/23 I got charged R3305.87 for a product that was never used, returned unopened and sold to me on false (**** to) claims.