I completely disagree. I've had the same problem with PayPal and Venmo. At some point, if anything goes wrong, they just say their security system has flagged y

I completely disagree. I've had the same problem with PayPal and Venmo. At some point, if anything goes wrong, they just say their security system has flagged you and there is nothing they can do. They can't even tell you the issue. You just have to wait and hope it eventually clears you, hope it doesn't flag you the next time you do it (which it probably will somewhere in the algorithm, since you've been flagged before) or close/cancel your account.