Stalling my payment with no reason given

I registered at LeoJackpot on the 25th of April, I made a deposit and accepted the welcome bonus. I played Dead or Alive at 7 euro per spin
and had a huge win. Once my wagering requirements were fulfilled I had a balance of 40728 euro. On the 30th of April I sent LeoJackpot an email containing my drivers
licence and passport. On the 2nd of May they responded saying 'Your documents have been
registered'. On the 3rd of May I attempted to access my LeoJackpot account, only to find I
was unable to log in. I sent them an email and received this response:
'We kindly inform you that your account is currently been checked by the relevament department. We will keep you update.'

I have emailed them three more times since this response, requesting an update on the status of my account and they have either not responded or simply copy/pasted the same misspelled message:
'We kindly inform you that your account is currently been checked by the relevament department. We will keep you update.'

They have given no reason for the closure of my account. It has now been more than one month since my win and I am not confident in LeoJackpot’s professionalism nor their intent to reopen my account or allow me to make any withdrawals.