2002 Volkswagen Passat air conditioning & heating problems

In late january, the heated seat on my 2002 volkswagen passat burned through the seat cover. It also burned through my pants and gave me a minor burn. Volkswagen repaired the problem, but the mechanics informed me that I was the third such problem in a 48 hour period. The other two cars were jettas. Another mechanic said that the heated seats ran too hot on the highest setting and weren't meant to run on setting 5 for too long.

I turned on my driver's seat warmer after not having used it for several months. Within 60 seconds, I smelled a burning smell and turned the warmer off immediately. I immediately noticed a deep burn on the seat, just to the left of where I sit, that is larger than the size of a quarter. I have not yet brought this to volkswagen's attention, but I intend to do so shortly.