You're a perfect victim. They know it. So they're working you again.
You say "many DIFFERENT people" have been calling you offering to help get your money back. How would they know you lost any money? Only the scammer knows this.
Those "other people" are in fact, the same scammer AGAIN.
Your name is now being passed around amongst different people at the scam company, and they're all taking a swing at you. They like to put their effort where it has the best chance for success, and a prior scam victim is likely to be weak-minded and fall for it again. It's just business, nothing personal.
You were careless. Now, cut your losses, walk away and NEVER FORGET.
And by the way... in the future... almost ANYONE who calls you with an offer or a threat is ripping you off. HANG UP.
Say someone says "they're coming over to arrest you unless you pay your back taxes in iTunes gift cards" - that's a flat scam.
They say they're from AT&T and want to sell you better Internet service - say no and HANG UP. But then, research the various internet providers' prices - Comcast, Verizon, Charter, and sure why not - AT&T. Find the one you like the most and switch.
If a caller says "we want to make you aware of a government program that could benefit you", then take some notes, HANG UP, and then go research independently via government sites only, and see if that program really exists and if you qualify.
Never use a phone number or web address they gave you. That's likely to be a fake.
When you take action on your own initiative, you get the best deal and the best protection. When someone calls you and you agree to it, you always get a worse deal.
Now there's a longshot possibility that the caller might have a slightly better deal than you could get on your own... but that is highly unlikely, and the deal would be barely better, so it is not worth the risk.