Wtf scam is samsung running

I purchased a zfold 5 online because I cracked my s22 ultra. I purchased both phones direct from Samsung to avoid hassle and take advantage of the trade in. I filled out the trade in form admitting the screen was cracked to take the lower value. I received an email today stating they actually received a s7 and they would be charging me an additional $300 to make up the trade in difference. I've never even owned an S7. They did include photos of the supposed phone but nothing showing the paperwork or box that phone came out of. Has anyone had this issue before? What's my recourse here it's their word against mine.