Sim swapp

Hi

I was a pre paid client of cell c, I lost my cell phone on 8th july and have been trying to do a sim swapp for the past 3 weeks, i don't know how many times i've called the customer care line. at 1st the issue was a proof of address as at the store they wanted a posted letter and not a bank statement, as someone who is renting i always use my home address so i made means to go home over the weekend and got a letter which i took to the cell c store in Parow centre yesterday only to be told that i cant get my sim swap as the numbers i'm providing are not the last numbers dialed. i provided 5 numbers which i frequently dialed 2 of which are my partners, my sisters and 2 best friends, but the lady told me they want the last 3 numbers, how am i supposed to remember which numbers i lost dialed more than a month ago. Cant they even think that maybe the person who took my phone could have made calls before removing my card??? So right now i'm leaving cell c n would rather go to another network if i hv to change my number that i've had for more than 5 yrs just because i cant remember the last 3 numbers i dialed before i lost my phone.