Bad customer service

On the 17th March 2024, I called to report a lost Cellphone to MTN South Africa. After providing all the information that was required, I received an ITC Reference number to say the Cellphone was blocked. I asked them to block my Cellphone number and I was told to go to MTN store as they don't do that online. I then went instore with required documents ,they did what they were supposed to do and helped me with the Sim Swap and I was told to wait for 2 to 24 hours for the number to be activated. But unfortunately till today my phone with the same number I was using is still in use and someone is using it to **** my contacts money pretending to be me, they are sharing my private pictures on social media. I went back instore and I was told it's difficult to do a Sim Swap because that number is still in use. I am really disappointed in the service I received from MTN. This has turned into a nightmare, someone is using my phone and number to tarnish my reputation. I plead with you Hellopeter to help me