Ordered & installed new tire

I had to call roadside assistance to take a flat tire off and put on my spare. I took the flat to Delco Auto to see if it could be fixed. Steve said the sidewall was torn and I needed a new tire. He ordered it but in the meantime my boyfriend said I should try Tires Plus. Unfortunately due to the storm they were closed. So I got the tire from Delco because it's the closest tire place and I figured I could walk over to Walt's and get a steak while I wait. Steve puts the new tire on then comes inside and hands me a lug nut. He asks me who put the spare on and I said my roadside assistance. He says, "well they broke this lug nut off, and the pin that it screws onto is broken off inside. You need to call them and see what they'll do for you. They'll probably try to blame me, but this was already broken as I was taking the spare off." First of all, the guy from roadside assistance used HAND TOOLS. How much strength would he need to break off a pin and a lug nut with a tire iron? Second, if it was broken how did Steve hand it to me? Wouldn't it just be gone if the roadside guy broke it? This is simply a nightmare. I should have waited another day and gone to Tires Plus where surely this type of thing doesn't happen and if it does, they'd own up to it. DO NOT DO NOT DO NOT go to Delco Auto & Tire.