Call SIG, they'll send you a return ticket for your gun and they'll make it right for you.
I recently had issues with a new SIG Traditional Compact but they took care of everything in very short order. My experience with their customer service was great.
“Never give in. Never give in. Never, never, never, never—in nothing, great or small, large or petty—never give in, except to convictions of honour and good sense. Never yield to force. Never yield to the apparently overwhelming might of the enemy.”