Disgruntled with service from Cell C Shop

Good day, I have been using a Cell C prepaid line from 2018 till Wednesday this week when I lost the phone. I went to a Cell C Shop at President Square in Krugersdorp on Thursday 17 Feb where I was served by this Indian gentleman. First of all I tried to greet him to which he immediately brushed off and requested for my ID before even taking a seat. Reason for my visit to the shop was for a sim swap. I gave the gentleman my ID, told him my number off head, told him when did I obtain the sim, gave him when last did I recharge and how much. In addition he wanted 5 last dialed numbers to which I recalled 2 numbers that he confirmed as correct. I wrote all the other numbers that I presumed had dialed, but he said they are all not in the system. Bearing in mind, these days most calls are conducted via WhatsApp because of cost effectiveness. However, I am told Cell C need strictly normal call dialed numbers. As a result, I could not retrieve my sim despite providing the rest of the requisite information.

Is this really Cell C’s conduct and if so, then you are bound to lose a number of customers as a result? Are you telling me there are no other alternatives? The gentleman who served me was just quick to dismiss and tell me to return once I get more dialed numbers