Midas review: oil change promotion

I've been going to Midas for years and never incurred a problem until this new manager. I had a receipt for every oil change to get the sixth free and because some of my packaged envelopes did not have a stamp he wouldn't accept them (even though he could read the receipts showing I received the service). Needless to say I got angry. How are you faulting me for the way I was checked out? I have the receipts! His explanation is that's not the way it works (Sham). In my anger I got a new envelope with 5 stamps to get the next free. I suggest that you have all your envelopes stamped regardless of having receipts because this is their way of not honoring their promotions. What happened to the customer is always right? I'll go back to another location (not Monroeville) for my free oil change and won't return thereafter. They lost a customer in me!

Repair order#0177143 on 7/13/19. @10:30 am