Upgrade

I get a phone call from a gentleman at Cell C Cape Town on 6/08/15 to upgrade my data contract. I do so & the modem is delivered to me on the 7/08/15. On the evening of 6/08/15 I see an Ad on TV for a higher plan than the one I upgraded to. I want to change to the slightly higher plan, but the number on the invoice does not work. The gentleman promised to phone me on 10/8/15 to upgrade one of my cell lines but I have not heard from him again! I then phone Customer Service and am thrown from pillar to post speaking to what seemed like every consultant they have! I then get told that Migration department will phone me. This consultant phones me and informs me that there is no notation on the account as to who the consultant was that did my upgrade and that if I change the contract I need to migrate and instead of it costing R199 as advertised, it would cost me R249 because I have received a modem!! I explain that the modem is still sealed as I received it and all I want is for the R149 contract to be changed to the R199 contract. I was promised that I would be contacted within 48 hours by the original consultant and it is now 6 days and I have not heard from anybody ...