retaildiscountshop.com Castle Club Rewards, LLC Scam coupon club NY

I noticed a debit card charge for $37.50 to "RETAILDISCOUNTS 888-6983849 NY". I had never heard of them and had never given them any money, so I called my bank and reported it as a scam. The bank told me that the money went to Retail Discount Shop, aka Castle Club Rewards, LLC. I left a message with Retail Discount Shop and they called me back the next day. I told them I had reported them as a scam, and they sent me this email:

"After placing your order with PartsGeek.com you were presented with an opportunity to join our club. We are a leading online rewards program that provides our members with exclusive discounts, rebates & price savings.  With over 250,000 local and regional retail merchants to choose from, you are sure to be able to find incredible price savings and discounts all across the country. You should’ve received email confirmation after the initial sign up confirming your membership. If you did not intend to sign up for this, we are sorry for any confusion you may have experienced.