Cannot SIM swap even after escalation

I bought my Samsung Galaxy Core on the 23rd August and was excited to use it - but I first had to do a SIM swap as I needed to upgrade my old SIM. I did the SIM swap at the MTN shop at the Grove Mall in Lynwood. I then got an SMS on my old phone to confirm the swap, which I did. Nothing happened so for that whole week we called the 173 call centre trying to get the SIM swap to go through - at least 3 occasions. Still nothing happened. On Friday the 28th August my husband called 173 again, the agent agreed to escalate it to a supervisor since my previous SIM swaps failed. The following day I checked and once again the swap didn't work. Now very annoyed, I asked my husband to call 173 again on the 29th August. The agent said that she will escalate this to a supervisor but since its weekend the supervisor will only get back to me during the week. After my husband expressed how unfairly we were treated she promised to personally escalate this to the supervisor on the following Monday and get back to us when her shift started at 3pm. This never happened and once again I am sitting here wondering what it will take to get my SIM swap to work. My business is being impacted by this!