Contract cancellation

First I want to ask why didn't MTN advise they clients that we were taking a contract with Mondo and not with MTN (or when sales person calls should state that the calling on behalf of MTN and the contract will be with Mondo(Thirds party), because when they call it shows MTN contracts so in my mind I though I was doing an upgrade with MTN that B****

I did an upgrade with Mondo not knowing it was them than I received the new phone I was not happy with it I returned the phone within 2 days to an MTN store, when i called few days later MTN told me that my contract was with Mondo which I was surprised, I should called them to ask about the cancellation ok I called them only to be told it takes 7 working days for the cancellation I called after that 7 days than I was told no its takes 14 working days I called again after 14 days I was told no its actually takes 21 working days for the contract to be cancellated. Very poor service delivery that all those consultants were not trained to give us the true infor of how long the contract takes to get cancellated.