Transferwise is not crypto friendly
That's unfortunate there customer service is that bad. I would recommend to transfer a lot smaller fiat in the start and do more smaller tests.
(Bank > Transferwise > Revolut > Exchange) Thats true but if you did it this way you can avoid that problem.
(Bank > Transferwise > Paysera > Revolut > Exchange) If you do it this way it will be a lot faster, don't know about the fee yet though.