SIM Swap - No Service

I have 3 Contracts with Cell C. I have been a Cell C Customer for more than 10 years and my account is up todate in all the 3 lines. I called Cell C this morning to do a sim swap on my Data Line and after more than 40minutes on the line I was told a SIM Swap cannot be done because I have not used the line for 90days. This inspite that I have been paying my account in full. I upgraded my other voice contract and the phone was delivered to my office. I am told I need to go to the Grove Mall Cell C outlet to do a sim swap: The problem is that I got bad service in the past in the outlet for sim swap and I ended up not being helped. I lodged a complaint with Cell C and it was never attended. Secondly I have to pay extra for doing a Sim Swap at the outlet compared to doing it with Cell C Direct. Why must I be inconvenienced for paying my account and not using my line? Why must I spend hours looking for an outlet and spend more time on ques to get the service that I pay for? Is that the thanks I get for being a loyal customer? Call reference number: ********** **********