Appauling and disappointing service

Appauling service from one of the leading supermarkets in SA. My days of buying my groceries from PicknPay are over, after being loyal to them for many years, just recently there was a promotion running to collect stamps and receive a pot set. As exciting as this was to most of the customers, i started collecting mine and got a nice pan in the beginning and then I continued collecting, to receive my next pot, but on the day i went (picknpay Wonderpark) we were told that they had run out of pots but that they would call us once they receive stock, i went back on several occassions to enquire about this but was told that there wasnt any stock still. I then went back almost a month ago, a lady by the name of Nthabiseng at Wonderpark branch told me that, they had sent back the pots and that they would never bring back the stock. I then told her that they did not call nor send me a message that i must come and collect my pot. She then gave me the customer care number and said to send my complaint to them. I called the same day and spoke to Mandisa, who told me that she would escalate the matter to the regional manager and that he/she would call me back. I waited for a week and there was no call. Again I called customer care to follow up on the matter, this time I spoke to Andile, who also gave me the same story of the regional manager calling back. Its been 2 weeks since my last call and today 01 sept 2018, I called customer care and after speaking to the consultant, i was placed on hold for 20 minutes and then the call was cut off. I am really disappointed, for me its not about getting a free pot but the service and promises that the store made to us. Maybe its bacause I'm black thats why I received this kind of treatment. I wasted tons of airtime calling them for nothing.