Bad service

I am very upset with Cell C. I lost my phone and I called to black the IMEI no , they only blacklisted one and there's 2 on the box. C Surrance requested that they must blacklist the other one. I called them and was told that the matter will escalated and it will take 2 working days. That was last week Wednesday. I called again Friday, no news and same thing Saturday. I called Monday the 8th, I haven't received anything. The IMEI is still not blacklisted.