Dischem ********* practise and customer service

Various Johnsons items had been purchased from the store, my infant is not using this range any longer. When requested that the items be exchanged, I was given an issue. The store was unable to locate the purchases on my dischem card and the manager stated that due to their promotional offers they cannot verify the prices paid without a proof of purchase. It's evident from my purchase history that I am a regular customer spending thousands at the store. This matter has been treated unfairly as I now have numerous products that is not going to be used and a waste of my money. In usual instances, due to covid, the proof of purchases are discarded of and there is a possibility of my dischem card not being used during the purchase or swiped incorrectly. I'd suggest using alternate stores such as game etc. which is hassle free in such situations.