Bad customer service

I wanted to pay for my stuff via my Sassa card - I was told that clicks does not accept that method of payment any more - shocking behavior, because I didn't get any warning of this new rule. I was cross. The lady cashier, without a badge, laughed me out in my face, and had a very careless attitude. The supervisor was just the same. This forces me to tell my friends to avoid this store, rather go to the opposition stores to get service. This all happened in front of the other customers.