Weird. If they had your phone number, they could also get your username and password, so it might have been a genuine call from Dwolla,
lol what?
If they had your phone number, they could also get your username and password, which to mean is the reason why it screams "this is not a call from Dwolla"
They verify the information you have by cross referencing it with all other information you give them.
I swear rule number one for most places is "we will never call or email you asking you for your password"