Loyalty Cards, & Discount Vouchers do stores really honour them?

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I am a great fan of loyalty cards, & Discount Vouchers but how many stores/businesses do you go to that really honour the “freebies” or Discounts you are entitled to? There is a certain Donut Franchise I use to go to that would stamp the card at every visit, but when came time to get my freebie. Would say their franchise cannot honour it. Then there was a Discount Voucher we Bought ($20 get over $200 in discounts) when we tried to use our discount voucher they would say “we have already given you a discount” So did we really need the voucher? What stories do you have?