If it's a brand new heli (like advertised) and it is a shaft and not a blade problem I'd personally do whatever it takes to leave negative feedback and then some. There's no way a "brand new" heli has a bent shaft. It would have to be a crashed heli with replacement parts and someone who obviously has no idea selling it or someone who just don’t care. Either that or the blades are so far out of spec they require ½ roll of tape which in itself is highly unlikely. Personally I'd re-check everything starting with blade grip tension, then static and dynamic blade balance then pull shafts out and roll on a flat surface to see if they're bent. Write it off as a not so fun learing experience...