@Kris-and-Wendy0
"Fastpay phone call"?
Wait...did someone call you out of the blue about setting up Fastpay through your Airbnb account, or did you contact Airbnb and change your payout method to Fastpay? If someone contacted you, then most likely a scam and your money is probably long gone, as doubtful the original call was from Airbnb but from a scammer.
Scammers can fake the caller ID to say Airbnb if there was a number they gave you to call. This is why if someone calls you saying they are Airbnb asking for payout info or other sensitive information, or to read back a verification code they sent - ask them to send you an Airbnb support message to verify - don't use any numbers they give you or give them a verification code you received in a text.
First thing I would do is go to your Account Settings and check your login & security and see if there are any unknown devices there. If so, then log out the device:

Then change your Airbnb password if you haven't already.
Then verify what your payout methoid is currently - I would NOT use FastPay and if that method is there delete it and setup a new payment method.