MTN /mondo not assisting with refunds

MTN and there subsidiaries caused me a loss of nearly R3000 with a call agent calling me to present me with a better option on my home router. After asking this agent on several occasions if this is exactly the same as what I have got and her confirming this - I got a smaller package on a 24 month contract. I had to get this investigated to cancel the contract which was confirmed to me electronically and confirmed that it will be at no cost. I then was debited by MTN double on both jul and aug invoices telling me this was costs for the cancellation between the shop the mtn call centre and now rewardsco (mondo who introduces themselves as MTN when they call you to be ******* into contracts) I cannot get anybody to sort this out. Mondo apparently needs a number which was to be given to me and then I must give that to them but if MTN cancels the contract they must refund me - so I am being sent all over the place and nobody seems to want to refund my money. This is absolutely ridiculous and to think that i have been a client with MTN since 1997. So sad to see yet again that customer loyalty means absolutely nothing these days.