At wits end

Never renew a contract online or via telephone with mtn. They pass it over to Mondo. I renewed my contract to a what sounded like a good deal, only to find that after 2 days of receiving the upgrade, that this package was not portable. This would not work for me. Mondo Agent informed me that they are unable to cancel this upgrade, I was assured that if I done an early upgrade, they would cover the fee. Almost a year down the line, between Mtn and Mondo, no luck. Numerous calls to mtn customer care, the results, waiting for Mondo. My problem with this is how is it my job to facilitate communication between two businesses, where I am mtn customer and it is mtn who gave my contract to a third party? Now mtn customer care can only hope n pray Mondo responds