First, make sure the product is really broken and not just in need of a fresh set of batteries. You'd be surprised...
If that doesn't solve it, let us know. We'll then give it a bash and see what we can do for you.
We may end up with sending a new part, a replacement unit, or a refund.
Please do note that, due to our business model (we don't hold stock and run mostly once-off specials), we do many more refunds than replacements.