I have taken my car to there service dept. A total...

I have taken my car to there service dept. A total of Three times. My first experience was not pleasant. The communication was horrific! It took over 3 weeks for them to charge me $1600 for a fuel pump and labor. 3 3mos later I experienced the same problems with my vehicle. At first they told me the fuel pump was bad but it wouldn't cost anything it was covered under warranty. Then a day or two goes by and they tell me I had kerosene in my tank so they would have to flush the cars fuel system. $300 Now the 3rd time was 2mos after that. Same problems same symptoms, but again it turns out that I have some bad gas. Hmmmm somethings fishy about that... No reports on the news about bad gas. I always gas up at the same spot. I have know enemies that I know of. And I bought a lock for my tank! I assumed the 6 master technicians they boasted about would have got me together already but I feel I'm being taken advantage of.