I won on the 25th of June 5500 EUR which they refuse to pay. I played exactly the same 2 weeks before on June the 9th and they paid in full, I won over 5000 EUR back then.
I emailed them and they replied that the terms and condition were changed on the 25th the exact same day I played.
There are ways to prove the time they changed the terms from older to new using google cache and thepogg.com website who track terms and condition but I did send them an email asking what was the time in the day the terms were changed - I played early in the morning - 3 times I asked them this question but they ignored and instead gave this answer
'Next update took place on the 25th July as previously communicated.
Please note that irregular play pattern apply to all versions of T&C and is the reason why your winnings were confiscated.'
This email very surprised me because only a day before they said this:
'Before the 25th of June 2015 when the old T&C applied bonus bets were not limited at all. Therefore, your winnings from one of the previous bonuses were paid out freely.'
Anyway, they applied a spirit of the bonus clause in order to avoid paying.
I was playing ThunderStruck 9 a spin and gambled up my bet in the Gamble feature. I played exactly the same couple of weeks ago and was paid smoothly.