Bad After sales service

I called requesting a print out of receipt of goods purchased on Sunday morning.. I was overcharged for hair products (Pantene ) Which was advised under a label stating buy 2 products for R80 which was not the case and and refund was done but the till slip was not returned. I have call the store 5 timea and 2 occasions I was put on hold and the other the 3 occasions I was promised by Sharon that she would call me back in 10 minutes. Today Thursday and still no feedback. I spent over R1000 there and this service is pathetic and I will advise friends and family not shop there Disgusted at the after sales treatment. Let's see if they respond to my post