Yes please I totally agree. Something big must be going on there. I once bought an item through an Instagram ad. For about a month I got fake updates about shipping. Then one day I get an email that itvwas delivered 2 days ago, complete with a different shipping path and an apparently real USPS tracking ID. Of course I received nothing. Complained to PayPal, the complaint was closed within minutes as not valid.
Yeah, don't do that. Instagram ads are no different to the WURGLBIXY and HUYTVING and XORMLINAP and other smashed up syllable "brands" on Amazon, except they'll mostly deliver something to you, even if it is shit.
Take any of the images from an Instagram ad. Someone, somewhere, did (probably) build or design the product being sold (a lot come from Kickstarter and may have never launched), but if you search you'll find hundreds or more scams riding on that coattails who will hope to collect and fuck off with your money before IG shuts them down (if they ever do).
What compelled you to buy something through an ad? Does it often work? My operating assumption is that every click-through internet ad other than major brands (Apple, car makers, etc) is basically a scam.