lol, moth balls in fuel tank does nothing to harm the engine, some people claim it increases the octane level but doubtful, sugar in fuel tank, no dice either, it does not do anything other than make a mess and possibly block a fuel line.
if they legitimately ripped you off by $300 call a lawyer
I call bullshit on the whole story, it all sounds like a load of crap becuase if it was for real you would have done soemthing about it rather than start acting tough on the internet, I bet you would of done something illegal if it weren't for so much to lose, listen to yourself, you sound fucking retarded, are you 50 cent? or someone close to the poser?
Now I have to know that you exist, thanks for ruining my 2010 11 hours into it