2 Years to sort out a number

Firstly MTN cheated us by not loading our new phone with the contract of free minutes and data. So we were billed double. This took a year to sort out, as yet no one has apologised for their mistake. We were so upset by the lack of service to resolve it, we paid MTN out for the 2 year contract, and all we asked in return was to please keep the number which we have had for over 15 years. We were promised this by their legal department. Since then it has taken us over a year to do a simple sim swop to retain the number. STILL as to date.....we have not had any luck or answers as to why this cannot be done. We have been into MTN stores every day for the past year, we have called the call centre a 100x. Veronica Smith from MTN kindly tried to help us with this issue, but also cannot win. Please can someone from the correct technical department contact us to help us sort this matter out. We are totally exasperated, and our sense of humour has completely failed.