When was your card blocked? Did you get to use it several times, or was it blocked right from the start? Was it blocked after trying to pay with it, while trying to withdraw money from an ATM, or while trying to pay for something online? I'm hearing most of the times mBank or WBK cards get blocked is whilst withdrawing from ATM internationally.
Most likely there isn't anything you can do apart from visiting them with your ID or passport, or mailing it to someone you know and trust locally in Poland (assuming your card isn't permanently assigned to your real name).
I used it several times.
Last year I used it until it reached the 10k PLN limit and this year I used almost 5k PLN.
I did a lot of international ATM withdrawal, yes.
Right now I have no risk sending it to someone in Poland since I can't use it anyway
Maybe some member here work in mBank or know anyone who does.
Thanks for your help!