Contact the site's administrator or support. they will probably be able to help you if they are not scammers.
That's the problem, on the site there is no support (according to the site).
Thankfully now that I've had some sleep my brain has started to work properly and I did a little bit of digging on this site. Found the site owner / operator and now that I've got a couple of posts down I can PM him.
And here is the post that says that zet.coinmine.pl is IN BETA.
Hi,
This is my first pool for non-scrypt coin so please treat is as beta! Until its fully confirmed fee is 0% (for live pool it will be 1%)
Pool supports stratum and vardiff
Join if you like
feeleep
Right, now imma go and PM him and see what happens.