Bad service

So we went to Builders Warehouse in Bedworthpark Gauteng, where we always do our shopping on goods need for our business. On Wednesday 1 November we went there again and had a lot of goods in our trolley, our total value after ringing up was almost R3000. My husband had electrical gel goods four packets that was on the shelve and price was marked on shelf R99. At the pay point the lady could not find the product, her computer keeps on show "Not allowed to sell product". So with an attitude and sarcasm she told us she can not sell this goods to us, my husband said but it is on the shelf and with a price???? Surely a supervisor can overide somehow. Still with a ****ty attitude and laughing and speaking in her language with other workers (looks like we are fools) she refuse. My husband then said please call your branch manager. Still laughing and talking with fellow workers in her language that we can see she is talking about us another lady went to call the so called Manager. that we wait for like 15 minutes to arrive. What a disgrace!!!!!! Absolutely no help from the so called manager also, she also had an attitude that is not good for any manger in a business, after about an hour my husband said, lister we leaving all the goods and will go to a place where we get service, we travelled a distance to builders but rather go to some other place where the staff is friendly and helpful. They did not even bother to help with that product OR to say no please lets see what we can do, they rather loose business. That branch will never see me again will rather take my business somewhere else.