What is the prompt message you received when your withdrawal request was declined?
If you have limit you should be notified when you try to withdraw, but then looking at what you mentioned, I don't think you have any wagering limit to meet up to before you can withdraw, I think you best have to read through some terms of the bonuses from free bets to know if there are conditions to winning from your $25 free bet that you turned to $100.
Thanks for the feedback! Unfortunately I get absolutely no other error message, the withdrawal attempt is not displayed in my profile either. It is therefore probably a technical error or something similar.
In the meantime, I have opened a support ticket, the support team contacted me immediately and is already looking into the issue. These are top response times!