Pathetic,*********** bad service I have ever experienced

I have experienced bad service but today the incident I have encountered ticks it all. I was at Brits mall Ackermans to get my daughter's add on uniform and some stationery. I saw lunch bags nd thought let me get her one. While we were checking for the bags we noticed that some were marked down nd we took the one she wanted nd it was marked R19.99 to be exact while the same other bags were going for 39.99 obviously we took the most cheapest as they were the same the difference was the price tag. When we got to the till points we stood for long as only 1 till was operating then patiently stood there. I finally got to get my things scanned then boom the operator tells me the bag is R39.99 I said to her well can u see the tag she says yes I said to her the price shows 19.99 thats the price i will pay. Then the whole thing started. Theycalled the lady who asked me ridiculous questions,as if i work for Ackermans nd the humiliation as if i changed the price to suit my needs,the manner she handled the incident never once did she introduced herself as a manager she told me that she is not going to change the price. That's when I asked for the head office number she gave an attitude "u can call them"as if she is doing me a favour. I called them which aslo I wasnt impressed the lady I spoke to at the HO Khunji said they will get back to me after 7 days whats that. If I am a customer who has been happy whitg the store Im mainly purchase my things on lay bye in Jhb and there I must say very pleasant people to do business with. Apparently the rude lady who calls herself a manager but cant make the decisions on her own her name is Precoius. She needs to be taught about retaining customer's she lacks that. I ended up leaving the merchandise as i feel am not going to waste my money for someone who does not have the decency to apologise nicely to her customer's. There is one question that I need an answer from her does she treats all her customer's like that or she took an advantage because I m young and challenged her since she thinks that i go around changing price tags.