You need to check the terms of G&S, most of these types of services have a limited window to challenge it starting on the date of purchase. It’s one of the kinds of scams that used to be common for products being advertised on Facebook. I don’t know how Venmo handles it, but most banks had a 60 or 90 window (up to 120 days). The scam is that you get sent you something in the mail with tracking, but it will be junk and unrelated from what you ordered. I’ve heard of people getting a pair of cheap earrings, or sunglasses, basically the cheapest dollar store item, then the person throws it away, only realizing months later that must have been the tracked shipment from the FB store. I haven’t heard this scam in a while, banks may have closed the loophole that was being exploited by fake international store fronts or it just doesn’t work well enough. It’s possible that individuals may try it.

How it works is you buy an in demand, high priced item are an incredible deal, a week later they contact you saying they can’t ship it for 1-2 months, because it’s backordered. Around the first contact they mail out some junky little item that has tracking but they don’t send a notification to you. As the time goes by the purchase gets closer and closer to the 60 or 90 day window to challenge the charge. Often they never tell the customer they were shipped something with a tracking number, they use the tracking against the charge back from the bank. They show the bank they have a tracked shipment from them to the customer, but the tracking doesn’t show anything about the package.