Delayed payment for over 2 weeks and suddenly accused me of group-playing

I registered at mrringo the day 31/03/2017 i deposited 100 eur and got a bonus of other 100 eur. I compledeted the rollover correctly and i reached the amount of about 1500, i verified my identity sending all the documents they requested me and i asked for withdraw about 2 weeks ago.
From that moment on the troubles started... no trace of the payment, i've been contacting them in the chat every single day to ask for news about my withdraws and they told me in order
1) you used a bonus so department must check if you used it correctly, following the terms... (i told them "this process takes 5 mintes")
2) after some days they told me the payment is a little slower because of easter holidays (i told them "now holidays are finished")
3) finally today i contacted them in the chat like every day and they told me "your payment will be handled as soon as possible" i kept threatening them to open complaints at all the sports and casino portals if they don't pay very quick and at that point their interpretation changed: now their legal department is holding my account because of groupplaying. Maybe they have done it in the last 5 minutes??

Now i really even don't know the meaning of groupplaying, i opened the account by myself and i'm the only one who betted and played at casino and this is just an infamous excuse to not pay me.