agreedEverybody is assuming that the company is going bankrupt but it looks to me that they couldn't get affordable insurance and they let it lapse. Maybe RBT has just made the decision to close their doors, collect their AR, pay their bills, sell their assets and living off of what is left. Exactly what any good business would do.
Remember, there was nothing bad written about this carrier, no reports of double brokering. Lets give them the benefit of the doubt. If you owe them and there is no indication of foul play then pay them what you agreed to.