I'd be on the phone to S&W customer service and have a pre-paid postage email in my box before the sun went down.
I'm a passionate defender of the newer version Sigma's since I've owned four of them, all trouble-free, inexpensive, and dependable.
S&W has improved the triggers on all of four of them at no charge and within about 10 business days.
Sorry to hear about your misfortune.