The problem is not the bank but Gox obviously lying.
I called and they told me the standard daily limit for a basic company is 100kk PLN converted according to the daily exchange rate in EUR.
Here it is!. Article 26. Feel free to read all of it. A short quote of the most interesting part:
(a) the average of the preceding 12 months' total amount of payment transactions executed by the person concerned, including any agent for which it assumes full responsibility, does not exceed EUR 3 million per month. That requirement shall be assessed on the projected total amount of payment transactions in its business plan, unless an adjustment to that plan is required by the competent authorities; and
[...]
3 million EUR per month =~ 100k EUR / day maximum. Who is lying? At least MtGox agrees with the EU Payment Services Directive 2007/64/EC.