I am retired military. I have never had a problem getting a discount at Lowes. Never had one problem.
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I have had problems with the discount at my local Lowes so I no longer shop there.
They have me in the computer as retired military thus don’t even ask for the ID card any longer. They simply ask for the phone number and put that in, it calls up my info, he clicks the military button and I have my 10%. No worries. No problems. I would strongly suggest the next time you have a problem, you ask for the store manager and then put him on the spot with what the heck is going on and threaten to call Corporate HQ to find out what they have to say about the issues and his response to it. Try that.