Unhappy customer_upgrade cancellation requested 2 months ago

I have been getting the run around with Mondo and MTN.

I have done 2 upgrades, telephonically, on MTN contracts through Mondo on 24 May 2023. I have been trying to cancel the upgrades since 29 May 2023 (almost 2 months ago now). One of the upgrades were cancelled on 8 June 2023, after numerous emails. I'm still struggling to cancel the other upgrade. I have been sending numerous emails to Mondo but they have been giving me the run around and keeps telling me that they have escalated it to MTN and that they will advise. They don't keep me updated and I have to keep on following up with them. When i call or email MTN, MTN says that they didn't get any cancellation requests for that contract. I even went to the MTN store and they confirmed the same and said that only MONDO can cancel the upgrade. This is really frustrating and unacceptable, coz the customer care agents gives different responses to my emails and I don't get any joy. Please HELP!!!!!