Can get no action or feedback

A Mondo agent did an upgrade for me on my MTN contract on 7 September. Two weeks later I still did not have delivery of the handset or the contract. I cancelled the contract directly with Mondo on 26th September and I was assured by a Yutan Naidoo that it was done so. MTN say they cant help me as the upgrade was done by Mondo. I have spoken to them again today 3 October as the contract is still not cancelled. I was blocked from speaking to a supervisor or a director and fobbed off yet again by them saying they require MTN to cancel the contract. I phoned MTN again and they confirmed that Mondo need to do the cancellation.

Not only have Mondo not fulfilled their contractual obligations, they have misled me by quoting an amount for a contract which is not what I am billed - this is *****.

Can someone in this shambolic, ********* organisation contact me and cancel my contract.