Mondo: no accountability and ****s

Hi

I am going to get straight to the point.

In January I was contacted by MTN Rewards "MONDO". The lady on the line said because I was such a loyal and good customer (over 10 years) and never missed a payment, even during the covid. That I will be rewarded with a laptop, extra gigs per month and that my installment would be reduced. Well, that was a lie. After I recieved the laptop my installment doubled. A second contract was issued. I complained, they reviewed the call and confirmed that I was mislead and that they would cancel. After a while I was told that this additional contract could only be canceled once the laptop had been returned. I have done that. But still nothing has been cancelled. I will not and cannot pay the additional costs. The advice I got was just to pay and then it will be refunded, but it is now almost 3 months down the line and it has not yet been resolved how long would a refund take? I have contacted MTN and the "Mondo" but just get transferred around and then cut off. Nobody whats to take responsibility to fix this. Now my contract has been migrated to a pay as you go. This is infuriating. What and how can this be resolved? The reference number for this complaint is RCO351160 and RCO375855 The number for returning the laptop is M777WR136A***C985