DSI is a mess, they add rules on top of rules and often even their CS agents are confused about the rules.
I did happen to know that you have to use the bonus balance to meet the roll, but I don't blame you for getting that wrong.
They added that rule about $100 counting towards the rollover if you take a bonus of over $1000 on the same day that I made a deposit and got a bonus from them. I ended up having to meet a rollover of over 100k $100 at a time.
They also added the rule about how much you could cash out after my deposit... but it didn't matter since I had lost so much just blind betting the boar to try to get through the roll.
In fairness, I think it might be a decent book to play at if you don't take a bonus, they hang some square numbers sometimes... but I'm never going back.