Horrible and unreasonable service

Worst service I received from Cell C. I have been trying to blacklist my phone for over a month to no success. I called Cell C to blacklist my prepaid phone. I was asked security questions of which one of them was that which last 2 numbers did I dial before I lost my phone. When I could not answer that because I could not remember, i was reffered to the store. I went to westgate store and i was told customer service would still need to call me for security questions. Now what was the reason for me to go to the store if I still need to be called for security questions i could not answer to begin with? The reason why I was sent to the store to begin with. Till today I have not received the ITC number and unable to put in a claim for my phone.