Hello, OP!
For faster and easier communication with willing forum users, please provide a screenshot of your conversation with the alleged representative you have contacted in Rollbit. Also, have you also tried communicating with the CS here in this forum? This is their
ANN THREAD and you can contact the CS there.
Also, be reminded that the amount you have pending is something that Rollbit would not want to risk their entire reputation. They have built their gambling empire due to the positive feedback that came from its users. I am very confident that your issue would be addressed and answers would be given.
To reiterate, please attach any screenshot of your alleged conversation with them including all the necessary dates, etc. for faster and easier communication.
Good luck, OP.