Good luck with that! They need to evaluate the esc before they ship you a knew one. That's just the way it works in the RC world. You will be very lucky if anything happens the way you want it to. Send it in and be patient or your going to be upset for the next month or so. I feel your pain, I spent $330 on a tekin rx8 combo, from Tower, that didn't work right out of the box, shipped it back $12.00 priority mail, got it back and it worked for about 5min, $12.00 shipped it back, finally got a new esc and it's worked flawless ever since. Long story short it took about 90 days to get a working system. Tekin made good on it in the end. I was loco for the longest time but now I'm good!