I’m sure this is a scam, so I’ve never called the number, because that seems to be what they want me to do, and so I don’t know what the exchange is like, but I assume it’s phishing for personal information, especially bank account info.
This happens to me maybe twice a year (albeit, in early 2020, it happened about twice a week). Here’s what happens:
I get an email that purports to be from PayPal, but the logo they use looks outdated (Google sear. It says that tomorrow, they are taking some large sum (in excess of $1,000, usually) from my account, as “pre-arranged.”
Then it says that if I did NOT authorize this, I need to call phone # 888-nnn-nnnn.
I always check my PayPal account to look for pending charges, and also my bank-- I never find any charges, so I generally ignore these warnings