CellC you are a great mobile company however you call center is hopeless

I phoned CellC online to upgrade my contract. However the agent I spoke to decided that my answers failed the review. I asked to speak to a supervisor as I really do know my name, ID, Home address etc.( I did move to a new address over 2 years ago now so I gave both addresses even though CellC does have my new details), just in case. When I spoke to the supervisor she said I failed the review which made no sense whatsoever as she would not tell me which aspect I was wrong. I gave up. As In was in a mall yesterday I ran into a CellC outlet and asked them what address they had for me. They had the old address, so I gave them proof of the new address. I phoned in again today, the lady I spoke to asked me my ID number, my name, which bank I was with, without any further questions she informed me I had failed the review. I give up, I will now get a contract via Vodacom or MTN.