frustrated and insulted

I went to the store on the 20th March, to buy my baby's pram n car seat. When interviewed by the sales lady she showed us how to use the product. When I confirmed the price she said that's correct R3299.99. She then said to me that she will have to go down to the warehouse to go get the stock. My wife is heavily pregnant and we had waited about 20mins, we were not advised that it would be so long. Then she arrived, thanking her we take the trolley to pay for our goods, firstly there was no bar code on the box, secondly the teller went to get a bar code now charging me 4299.99, which I queried, then asked for a manager and no one was there. The staff looked at me as of I had no money to pay. I know I'm correct in saying I pay for what I see. I have photos of the sticker that was on the item. When I went to the item on display after paying coincidentally it was out of sight. No staff had name badges for me to get names. I'm very upset reason being I was unfairly charged and treated as though I wanted a product but didn't have money. Due to this unsatisfactory customer service It left me dissapointed as we shop here ???