Poorest customer service by MTN South Africa

My phone was ******. I visited an MTN outlet in Rosebank to request for a sim swap. Upon the branch request, I produced a proof of residence copy, an ID card and bought a new cellphone because they insisted I can only be assisted if my new SIM will be presented in a cellphone. After taking a questionable and failing few times though I answered to the best of my knowledge, I was told to wait for 24 hrs to have my number back. (Other network providers were able to do a sim swap and get my number within 15 minutes.as I lost two phones at the same time.) After 24 hrs, I inserted the SIM card and sadly the number that came out wasn't mine. I called MTN and I was told that the person who stole my phone declined SIM swap request. I was taken again through a questionnaire and was told that I have again failed verification. I requested that MTN block the SIM card, and I was told I was blocked. I made. A call to the number and a male voice answered and loughed at me when I asked why he is using my number. I eventually called MTN and again requested that the number be blocked as I had evidence that my request was not honoured. With the prospect of loosing my number that I have been using for roughly ten years, I gave up on MTN