Dissapointed by Pick 'n Pay Glengarry

Very unhappy with my experience at Pick 'n Pay Glengarry today. Their card machines were not working, so I had to draw money from the ATM in the shop to pay cash. One of the notes that came out of the ATM had a corner torn off and Pick 'n Pay refused to accept it. So I had to draw more cash. Upon arriving at home I saw on my till slip that they had not given me discounts for many of the promotion items that I purchased (e.g. buy two save R10). I also checked the SA Reserve Bank website and it states that a note holds the full when less than a third is gone or mutilated.