MAKRO DOESN'T TAKE ITS CUSTOMERS SERIOUSLY

I purchased a Makro branded product from Makro a few months ago. I misplaced the slip and might have used another friend or family members card to purchase the item , hence I can't track the invoice. However , the complaint and problem I have is it is a Makro branded popcorn sprinkles and I purchased two different flavors, both of which are not expired and only a few months old. The products were not exposed to moisture and kept according to required conditions as all my other spices are, however the Makro branded sprinkles started discoloring , the taste and flavor is completely off and it started clotting. I have other popcorn sprinkles from sterkiniko kept in the same place and this has never happened before. Other companies pride themselves in their brands and if there is a problem with their product they will be gladly willing to help the customer and send a voucher and collect products for testing. However when I visited the branch , basically Makro informed me without an invoice they can't help me, certainly the product brand item is indication enough the product is from Makro and if there is a problem with their products they should take the customer into account independent of the slip, as if it was a product Makro sells that was not produced by them, I wouldn't expect them to help me. However it is a Makro branded product. My other issue is I called the Head office and when complained the guy indicated someone would call me back, days later and no call back. Certainly not how you treat customers.