Still unresolved MTN MONDO

I have complained and written emails. Mondo admitted that it was at fault; yet MTN (via the messaging on FB) now says that I have FOUR contracts. I am being charged a cancellation charge for a contract that MONDO admitted was foisted on me. I have emailed MTN customer complaints, been into the local store twice, yet am charged . MTN says blames Mondo, Mondo says talk to MTN.