Pathetic Service from MTN

I called MTN on (14 August 2022,) Sunday evening to report that my phone was ****** on the (12 August 2022) and to subsequently blacklist the line. I was assisted by a lady who told me that the system was slow, and she would send me an email once it was actioned, to date no email correspondence has been received. I called in again on (15 August 2022) - Monday and was assisted by a different lady, I was then asked if the phone had the sim card which the contract came with, to which I rep**** no - it had a different sim card at the time. I was then told that they cannot assist me as it had a different sim card which makes no sense at all as the phone was on contract with MTN, the insurance was also done through one of their subcontracted companies. The lady also said I should call Vodacom to blacklist the phone and the number as the sim card that was in it was a Vodacom one, again this makes no sense as the phone was on contract with MTN and they should be able to blacklist it using the IMEI number which I provided to them. I have several contracts with MTN, this is the type of service which I am not accustomed to as a loyal user of MTN, I will cancel all of my contracts and share this experience with family and friends if I am not assisted in a professional and efficient manner.