Mondo partners with MTN LIE about contract pricing

Mondo Partnered with MTN called me for a add on on my Vodacom contract and he said it would only be a data package and will cost me R50 extra a month. End of the day and first billing month I received a bill of R480 for a new MTN contract which I did not want as I already have existing contract with Vodacom. Now since then I have been trying to cancel this contract as It was Cleary one massive LIE just to ***** money. Its one Year later And MTN is hitting me with legal notices for the account. Now I try and make the payment to get out of contract but the payments via EFT keeps failing with incorrect Reference numbers. Nothing seems to work to get rid of this absolutely horrible service provider. Tried creating MTN account but that did not even work from the first day. Truly astonishing that companies can get away with just lying and *****ing