Failure to blacklist my phone

I have been trying to get my cellphone blacklisted since Sunday, at the MTN shop in Pavillion they couldn't and escalated to support, was provided a reference number. According to MTN they cannot pick up my sim on the ****** phone. They advised that it will take 2-3 days. I just got a text stating that the case is closed, when I 135 called to get the ITC number, they advised me to go back to the pavilion shop and complete a blacklist request form, and that will take another 3-5 days to process. I have called MTN 135 during the day to get feedback, two of their service champions dropped my call, one of them was Nobuhle Dingindlela. I have also asked to speak to the supervisor, I was told they will call me