Puma Tank Hijacking?

I have played that level for 2weeks straight at a grand total of 30 hours and I can not beat that tank. I have tried everything including buying a new controller in case the old one (1 month old) was defective. I have called windows, gamestop, magazines and everything else and have come to the conclusion it was not designed to be beat. I near cracked my monitor from the f*&king frustration of it all. This the worst game in gaming history. I have seen countless blogs, forums and discussions and everyone says the same thing. AND THE TRULY F*&KED UP PART IS I CAN'T RETURN THIS PIECE OF SH*T!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!