Complaint Review: Autozone

I just got back from Iraq befor i got back my car was wrecked by a frend. So once I returned home I bought a new car with the money I had made while on deployment.
I visited my local Autozone Needing a valvecover gasket for a small leak on my new to me 2002 Isuzu Rodeo.
The "AUTOZONER" who helped me had 12 years of experince or so I was told after the fact, but I asked for a gasket, he told me that they didnt have any in stock that they would have to order some that it would take a few weeks to come in. But he has some additive that i could add to the oil to seal any leaking gaskets or seals.
We walked to the back of the store and he showed me 6 or 7 different items and slected a bottle of Bar's/18 oz. liquid copper block seal, intake and radiator stop leak, and that he "GUARANTEES" it to work to add it to the oil while the car is running just like an additive the leak should stop in 5 to 10 mins.
When I got home I did as the "Autozoner" instructed me to do within 3 min's the engin made a loud knock and then just died, it would turn over but would not start. so I left it as it was befor something broke.
When I whent back to the store and toled the "Autozoner" what had happend they said that it was an honest mistake that i should have used STP/14.5 oz. engine stop leak or someting close to it.
After some searching I got the number to the district manger or should I say the district mangers voice mail. After 2 days I get a call back from the district manger she then started telling me that the autozoner that had sold me the product had no recallection of our transation or the product. But she asures me that if he had sold me the product that he would have told me to read the directions and would have never guarnted a product for something that it was never ment to be used for and that it was my fault. so after tracking and looking i foulnd the number to the main office in Memphis Tn. after a few calls with 2 other mangers it was determand that it was my fault that i should have read the instructions.
When it comes to a socalled experts advice where does the libility really lie? now im out a means of transportation looks like i will have to take another deployment to iraq agean to get a nother car.

thanks autozone
The total damage is $1, 500.00-$1, 800.00 for a rebuilt engin befor tax and shiping of the new engin and labor.