Canceling a month to month contract with MTN is a nightmare.

I regret taking MTN's 5G router month to month contract. First of all their sales consultants **** to me and told me that it is not a fixed line which means i can use the router anywhere, after receiving the router it was blocked because i changed my location where i am using the router, i called their retentions to cancel and i was told i must return their router to the nearest store and i will get an IRMS number which i did. Today i called their retentions department to cancel and i spoke to Xolani and he transferred me to Mondo, Mondo told me they cannot assist and transferred me back to MTN, I spoke to another servicing consultant who told me that their retentions department is supposed to assist me, she suggested i ask for a supervisor or manager in retentions, when i got through to retentions again and i spoke to Samantha and i asked her to put me through to a supervisor or manager and she refused and told me that she will transfer me to Rewards Co and they will assist me to cancel the contract, and when i got through to Rewards Co i spoke to Mpendulo who told me that he cannot assist me, so i want to know who is supposed to assist me to cancel this contract, 2, why are customers not allowed to speak to Supervisors or Managers at MTN because as consumers we do have the right to speak to superiors, i do have all call recordings by the way and i am going to escalate this issue to the highest level possible, i feel like MTN has been allowed to mistreat customers for a long time and they were allowed to get away with it.