Failure to full promise and execute request

I took up a new contract with Cell C end of January 2016 and requested for a number change. The sales agent failed to do so and i had to call the call center more than 5 times since then for them to action my request and they wanted to charge me R250. The number change was then done by Excellent who said he was a team leader in the sales dept. on 17.03.2016 but Cell C mix up numbers. I requested for the *** number which came with the contract to be replaced with my already existing prepaid number ***. However, Cell C has now deactivated both numbers and provided me with the number *** and don't know whose number it is. I have called Cell C since the night of 17.03.2016 and spoken to 3 agents who could not assist me and advised me the Excellent or other team leaders or their I.T will contact me and i still await response from them. Both my cell c numbers are deactivated and i'm left stranded with no phone line to use and with a number i dont know