No spring included - Rival Arms Magazine Release for Sig 320

I purchased this because it listed both on this site, and the manufacturer's site that it came with a spring. I was building a pistol and figured that was 1 less part to buy, so I went this route. The release is average quality, nothing spectacular, but there wasn't a spring included. After contacting the company and then following up three more times, they are still looking into if it comes with a spring or not and will get back to me. Getting treated like that leads me to never purchase a product from them again.