general problems of the 2004 Hyundai Santa Fe

My 2004 Hyundai Santa Fe had a slow leak while on the highway and I always carried a can of fix a flat. I then proceeded tp a tire place to repair the tire but was told that because I used the fix a flat the tire could not be repaired. My complaint is that I have written to fix a flat to either confirm or deny this statement by the tire company, but so far I have not been contacted by anyone from fix a flat. Can you please confirm or deny this statement? the tire place told me that the dot has published a ruling to this effect, but I looked all over and can't find anything on it.

No prior warnings or conditions existed prior to failure. The vehicle would not start and it was diagnosed by a fellow coworker to be the fuel pump. Aaa was called to tow the vehicle , and upon arrival, put car in neutral to back it up in order to tow. Immediately, the front driver tire when flat, and it was a result of the front strut assembly breaking and causing the coil spring to snap and pierce the front tire. It has been 6 days , and I was still without the vehicle which was only 3 1/2 years old with 65,000 miles. I was told that nothing was covered by warranty and replacement parts were not available. In order to get the vehicle fixed quickly I had to accept parts from a 2006 vehicle.