CellC refuses to do a SimSwap for me

am very frastrated with the service I recieved from CellC I was recently ****** a contract cellphone which had two simcards the contract simcard and also a prepaid, I started using the prepaid simcard about 5 to 6years ago and I found the simcard at the mall issued by cellc agents and it was already ricared, I tried to callc several times to do a simswap but they kept on telling me that am only getting four questions out of those questions they asked therefore am failing they cannot assist me, I cannot remeber the last two numbers that I called but I definatly gave them numbers that I know for sure I have called before and I have also recieved calls from them, I used the simcard mainly for buying data and receiving calls from my customers because I get minuts from my contract simcard there is no way I will remember the last numbers that I called, and there is also a possibilty that people who took my phone used the simcard to call other people, I have been using the simcard for years and recharging it mostly with my internet banking I dont know how does that not count as an evidence, In all my bank accounts I use the same number even with the contract I have with CellC I gave them the same number, I even went an extend where I took an affidavit to prove that its my cellphone number. and now they are telling me that I should try again in 30 days, 30days its too much my business it falling am not getting any calls from my customers and who would call someone that they couldnt get hold of for the past 29 days, now am afraid I wont be able to afford my bills including the contract I have with CellC am losing alot of money everyday and just dont care.