I would not pay rent to anyone who cannot show they are an agent of the owner or that they are the legal title holder.
Robert is perhaps correct. May be best to move.
If the home is in Dolton, they likely will cut off water service if the owner's not paying the bill. Check with the village to get a status.
The bank will move in geologic time, and eventually an asset manager from the bank or their trustee will contact you to come up with a solution for possession.
If you're interested, you may be able to buy the home in the judicial sale, but that can take a while and you'll have to stay engaged with tracking the court status of the property.
Not a bad time to buy though....doesn't have to be this house and you may find that you can buy a much better home and not see an increase in your monthly expenses.
I doubt that anyone's going to bring you to an eviction proceeding if the landlord has abandoned the property and is going into foreclosure. The bank may do so eventually, but that's another story. Usually the trustee will get a case manager involved.
I attached an interesting article with a bunch of funny, but pathetic, stories regarding eviction, rentals, and a few scams out there. It's possible the guy claiming to be the new landlord is just running a fairly simple scam.
Any which way you cut it, trouble seems to be on the horizon. I'd check in with the village to find out if there's any local ordinances or resources that may apply to your situation.
Best of luck.