Bad Service

I contacted MTN on 135 number to cancel a number because the person that had that number passed away. After being transferred from pillar to post I actual got to a consultant who can but was not very patient to assist. He told me that I must pay a cancellation fee of R129. I wanted to know why, seeing that I have upgraded the phone of this number since April 2021. I had several calls from MTN to upgrade but told the consultants I do not want to upgrade. He just said I must go to my nearest MTN branch. Now I will just move my other number, which I received in 1998 (yes that is how long I am a client of MTN) and move it to another SP.