insufficient information provided by call centre agents

I got a call from a foschini agent,thanking me for handling my account well.As a reward they offered me 1g of data for R69.Little did i know that by taking up this deal i was handing over my mtn account to them.Noone in their callcentre explained this to me.I only found out when i called mtn to activate international roaming on my line and i was told to consult one2one as my account is handled by these people.I was schocked.this meant that i could not get the mtn 24 hour support and have to pay to call these people for support.All of this should have been explained on the call.They now want me to pay them R207 as cancellation fee.An agent i spoke to ,when cancelling the contract told me they will provide me with the phone recording .They all of sudden cannot provide the phone recording because they realize they did not explain the terms and conditions.Can someone please help me escalate this wrong business ethics