The way out is just to visit a branch and have a one on one discussion with the customer care for you to really know the reason why there is an embargo on your account and how to go about resolving it.
This bank doesn't have any branches. It's one of several that have popped up the UK that are purely web and app based which is why I wouldn't want to get embroiled in any proper ball ache with them. I have a Revolut card. I don't think I'd ever use them for anything vital because they're the same.
Bricks and mortar banks are doing their very best to dispose of physical custom too but there are still outlets where you could go and toss your cookies in person. It may not achieve much.