You claimed the deposit bonus so everything got wrapped up together and you have to make the playthrough on the deposit bonus.
You should not have claimed a bonus when you deposited. Yes they told you you have to deposit then you can cashout, but not if you claim another bonus with more rules....
It is always like this. If I have $100 of my own cash in my account at any casino and then I deposit some more and claim a bonus, the whole amount is not withdrawable until I am done with the new playthrough.
You need to remember 2 things:
1. If you win on a free chip and have to deposit to cashout, do not claim a deposit bonus (unless it is required).
2. Never claim a new bonus if you have cash in your account... play your account to 0 or cashout before you deposit again with a bonus.

hope i dont have to pay them back

