Bad Service from Mondo/Mtn

I have cancelled my contract with Mondo on the 10th of August 2021 via the live chat option on Mondo's website. Got feedback that the info was given through to Mtn. Many times I have requested progress of my cancellation and everytime the answer was that my request was given to Mtn to cancel it on their side. Today I have send Mtn an email to find out what is going on? Received feedback that my query was send to Mondo Sales Dept... So don't know how to cancel my contract if Mondo blames Mtn and Mtn blames Mondo... All I want is that the contract be cancelled and my sim card be changed back to prepaid.