Winner Casino - Refusing to accept my documents and not willing to pay me

UNRESOLVED
Ssanti United Kingdom
posted on January 8, 2015.

Hi,

A while ago I won about 3.000€ playing at winner casino and I requested a withdrawal after meeting all the playthrough requirements.
Winner requested me to send my documents and so I did. Then they asked for a new copy of my ID and I sent it.

After that, they requested me to send a notarized copy of my passport via regular mail. I sent it.. and after a few weeks I asked if I could withdraw but they told me they didn't receive anything. So I went to the City Hall to notarize a copy of my passport again and I sent it . This time they told me it arrived but they said that it wasn't valid (without specifying why) and requested me to send another one.
What I sent them was a notarized copy of my passport by the City Hall; it's pretty much the most legit copy of a passport you can get.
I don't know what else to do, I just feel they don't want to pay me and they are just requesting stuff until I give up.

What can I do?

Thanks and kind regards,
Santi

AskGamblers
posted on January 12, 2015.

Dear @Ssanti,
Any update considering your complaint? Thank you.

Ssanti United Kingdom
posted on January 13, 2015.

No :/
I haven't received any email.