MTN does not have insight in what MOndo does and now wants me to pay?????

MTN wants to hand me over to the credit bureau because of Mondo's incompetence with an incorrect contract that was cancelled. Mondo stuffed up and I am the one who is getting the blame and a blacklisting. NOW I HAVE TO PAY A CONTRACT THAT DOES NOT EXIST AND WAS NEVER USED BECAUSE OF YOUR PATHETIC PARTNERSHIPS AND NOT KNOWING WHAT IS GOING ON IN THE BACKGROUND WHERE I HAVE TRIED TO SORT THIS OUT FOR MONTHS! + I HAVE NEVER RECEIVED AN INVOICE FROM YOU EVEN AS YOU DONT EVEN HAVE MY CORRECT EMAIL ADDRESS!!!!