MTN ******** billing because they use Mondo/Rewardsco's pathetic services

Account nr: A********** I been an MTN client for almost 30 years.....I took out an up grade telephonically in March 2022 which I was told MTN was calling me but it was a third party company called Mondo/Rewardsco (they **** on a recorded call which is against the TCF rules), I requested only for the phone to be up graded but to leave the contract I was on the same with mins and data (500mins and 2GB data), the consultant confirmed the cell phone was only been upgraded, I agreed to the new contract premiums on the upgrade, I received the new cell phone to which I thought all was in order come end of March I was billed a pro-rata premium. On the 12-04-2022 my new circle comes in and it was a different package (10GB & 25mins), I call MTN and was told they can't help me(the company I have my contract with) I have to get in contact with Mondo/Rewardsco the TP company who **** saying they are MTN, it took almost 3 weeks for them to resolve the problem then on my next billing I was charged again another pro-rata amount for Mondo/Rewardsco's mistake, I then had enough of this poor and pathetic service, I then requested for the upgrade to be cancelled mid May 2022, Mondo/Rewardsco said they will arrange for a courier company to collect the cell phone (which was still brand new never been used...thank God) from 20th May 2022, till the end of June the cell phone was not collected, I returned the cell phone to the MTN store in Cresta if I hadn't done that I think I will still be waiting for them to collect the cell phone, I was told I need to get a IRMS nr which I got and gave it to Mondo/Rewardsco in July 2022 (IRMS nr: **********-1) and in all this time MTN was billing me the new up grade package which I had my bank to reversed as I was not going to pay for an up grade which was cancelled in March 2022 and because I reversed the debit order my cell was suspended every month for about three weeks till the new circle for the loading of the mins kicked in. We are now in mid September 2022 and nothing has been resolved, when I contact MTN they say I must contact Mondo when I contact Mondo/Rewardsco they say they are waiting for MTN to resolve my billing, my last call to MTN I was told I was handed over to the MTN legal team for outstanding bill because both Mondo/Rewardsco and MTN has not solves my contact. I sent numerous emails to the MTN complains department in June Reference Number ********** no assistance again in July reference number is 953fa4d9-8bf1-43c5-a620-77e62daa12a and to date I have not been assisted or even contacted. I even spoke to Zaheera Sheik (Social Media Agent) from Mondo/Rewardsco (who said she will resolve this issue) in June 2022 and I sent follow up emails in July 2022 to date never got any response from her...pathetic service from her and Mondo/Rewardsco, I am not sure the way forward or who I can contact to resolve this and in the interim I am now getting a bad ITC record for un-paid bills because both MTN and Mondo/Rewardsco. Is there an Ombudsmans that I can take this matter up with. I am 100% sure MTN is losing countless of clients because of this Mondo/Rewardsco's pathetic services, you can now add one more person to that list.