bad service

On the 25th of November 2015 I went to buy 3 all star tekkies, at Footgear Canal Walk, upon purchase I made payment using a debit card, the three footwear cost R1350 but the cashier had punched R350 this only came to my attention after I received a call from my banking institution alerting me on what happened, I went to the store for verification the lady who assisted me, gave me the explanation but my problem with it is the way she approached the said matter, she made me feel like a theft and she played a race card on me and gave me a bad attitude because she knows I work at a nearby retail store, she threatened me by saying she will have me fired at my workplace for the mistake that the store has made of which I told her that I will go to my banking institution when I am off and see to it, my rights as a consumer have been violated and I feel that some kind of respect and good customer service could have played a vital role on the said matter,why must I pay for someone's mistake, some kind of compensation should be reimbursed on the said matter, I would like a response with immediate effect