Lack of service for a cancellation

I am appalled by the lack of service I have received from Mondo's MTN customer service side. I took out a MTN Fixed LTE line early in Jan 2022. They approved the contract as an add on to my account and phoned me to tell me that I do have Fixed LTE coverage in my area. I then got the sim and tried to get it working for a few days. After a complaint was logged a MTN technician phoned me and took my GPS coordinated and told me that there is NO coverage in my are and that I am to phone the Mondo cancellation team and get it cancelled. I did phone on the 27th of January to have it cancelled.... The consultant told me that it will take up to 10 work days. It has been a few months now... I am constantly phoning in and being told the same thing! I won't recommend using Mondo or any of MTN's service which they have to offer. They only cause headaches and credit record issues at Trans Union.