I am going to go to Poland again in a few weeks. This time I am going to go all the way to Warsaw and I am going to try to confront someone higher up in the chain and present them with a possible law suit. I have about 10 discriminating emails from Mbank with shit/explanations that are 100% illegal in the EU according to my local lawyer (ie you cant get your money back because these cards were meant for Polish people only etc). I think a class action law suit would be the best way to go - Mbank has had those against them before and they have always lost 
If anyone else is serious about suing them express your interest !
If anyone else is serious about suing them express your interest !I'm interested but I don't even think this is a case for a lawyer.
Like I said before they have to pay one way or another. They have to give you cash in hand or reverse the transfers to the originating accounts.
If they don't it's a street robbery! Call the local police and report it.
You can also call a tv channel and have them ask directly why are they holding funds from customers around the world against their will.
If you're going to Warsaw you can also visit these guys and ask their opinion:
You could try contacting KNF, I wonder what their response would be:
http://www.knf.gov.pl/en/dane_wspolne/complaints.html
Here's the address:
Location:
Komisja Nadzoru Finansowego
Plac Powstańców Warszawy 1
00-030 Warszawa
I don't know how good your polish is but it would be nice to have the help of some local polish members.