I bought 4 new tires and had them installed. The f...

I bought 4 new tires and had them installed. The following day I was on my way home from work and my back tire almost fell off. I stopped and had to tighten. When I got home I checked the rest. 2 of the remaining 3 were loose.This place is dangerous, if this happened to an older person or a child the results could have been way worse.