Sim swop

i had a cell c number for many years and recently lost my phone so I bought a new cell c sim to do a sim swop. when calling customer care they ask you a few questions which I could not answer in full and declined me and told me to go to a cell c store with my i.d. this I did but then they ask me for 5 numbers i dialled last in the order. serious how do you get that right. they asked me how many airtime I bought how I bought it and I answered them but because I could not give them the numbers dialled they could not help me although it shows that the sim is ricad to me . my whole fam switched from the other network to cell c a few years ago because i convinced them it was the best i am now rather moving back to my old network and all my family is planning to do the same and just port their numbers. at the other network they just asked my i.d and I gave them my old number I used before and it was all done i even had cell c numbers for my business but thinking of changing