Found ourselves with a flat tire, as it looked like we ran over a nail -hole was middle of the tire (ie: not side wall), in the still-very-present tread (tires have less than 10k miles on them) -no big deal, simple plug & patch (my SO worked for Discount Tire back *years* ago). This location told us it was irreparable. When asked to show where the hole was & why it was irreparable, the employee stammered & stuck to his guns, stating it's simply irreparable, that the hole was too big to patch.
We left that location & immediately took the tire up to the Discount Tire location on Elliot (3-4 miles away?) & they repaired it easily & no problem -simple plug & patch, they said. Yeah.
So just watch your back at this location. It's sad that we had to go through this, fortunately, with my SO's experience in this industry, we weren't taken advantage. Please look out for yourself & don't be afraid to take the time for a second opinion. It saved us the cost of a new tire.