So if I keep on claiming from free rolls, will it eventually let me redeem higher bonuses?
No.
Or every time I claim on free rolls the amount needed will always rise and rise and I will never be able to redeem better bonuses?
The wagering requirement to unlock bonuses will rise but that doesn't mean you will never meet them.
I can only redeem 1 reward point / roll or 10 reward point / roll. Sorry my english sucks, I don't really get your answer.
The higher bonuses are unlocked on accounts that wager enough proportionally to what they win for free.