I have always used Discount Tire Co. for my tire needs for the last 20 years. They have always been professional and courteous. I purchased the free replacement road hazard warranty on all the tires I have bought from them. It covers my tires as long as they have legal tread and are evenly worn. It replaces the tire if it is damaged beyond repair by a nail, screw, whatever. It does not however, replace the tire if it is worn out. I even had a pair of pliers go through a tire and they replaced the tire under their road hazard warranty. It sounds like a phone call to the manager may be warranted to straighten things out.
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