Disgusting service

I had the worst customer experience at the American Swiss Promenade mall branch. I walked into the store and was assisted by an sales assistant named Phathiswa. I asked her to get me any ladies watch not more than R300. So she showed me a few watches and I settled for one that cost R250 as per the price on the watch. When she rang up the sale. Turns out the watch was now R350 on the system. Now I tell her that I really want the watch n its a gift. She tells Mr it was a mistake. So now I'm telling her I want it at the price it was on the watch. Her response was, If I can't pay R350 then I must go look for a watch of R350 elsewhere. I asked to speak to the manager, but for 15min I waited and was told she's at the back on a call with insurance company. After asking how long she's going to take. I'm actually in a hurry. Phathiswa just said "I don't know how long its going to take. I can't just tell her to get off the phone" I feel ******. Would somebody please explain to me what your policy is with regards to pricing. I've been a loyal customer of the company for years and always do my gift shopping there. This one experience with the rude and dismissive assistant makes me want to close my account.