Disgusted by the point blank lie

I was in desperate need of a sim swap as my phone was ****** and my number is used for business, I went to Vodacom in Southdale Mall, I used to work for vodacom so I know all the prices and procedures. I was told by the one consultant as well as the manager that the Sim swap will cost me R70 and when I questioned them why they want to charge me so much and if they can show me the PSU charge that shows R70 they refused and sent me away saying if I do not want to pay the R70 I can go buy a Sim card somewhere else and do a Sim swap over the phone, in turn I had to buy 2 Sim cards just to get a Sim swap done. Really upset as to why they would lie about it.