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I received $1000 and was asked to send it back. How was this scam meant to work?
It could be money laundering. so: Answer 1: They didn't get your data wrong. They indeed sent you $1,000. How they obtained your banking data is another issue we won't address here. Answer 2: Your PII(*) was most likely compromised. From what you report, it included at least your banking info and your phone number. Probably more, but goes out of the scope of this answer.  Answer 3: Money Laundering is done in small transactions, to avoid having the financial institution filing a Currency Transaction Report(**). So they send $1,000 to several marks. Possibly at the stage of layering, to smudge out the paper trail associated to the money. Money laudering is a risky endeavour, and the criminals don't expect to have all the money they enter into the system come out clean on the other side. You really don't want to be associated with that cash, so the best is to report to your bank that you don't recognize that transaction and suspect illegal activity. In writing. Your financial institution knows how to proceed from there. Answer 4: Yes, and one of the worst financial scams. From drug trafficking, to human slavery and terrorism, that money could be supporting any of these activities. I urge the reader to access the US Treasury's "National Money Laudering Risk Assessment" report for more information.