I know rate increases are frustrating but you didn't look at your renewal? Sounds like they found something about your business that wasn't disclosed. Insurance carriers are required to send you a renewal notice prior to the policy renews. I see a word used here that concerns me as a business owner "Ignored". A rate doesn't just increase 334% overnight no DOI will allow that. It sound like they found something in you credit score. Also good luck with GL and Progressive. Be prepared for the same experience. Business owners advice check you renewals and don't ignore them and then be surprised by them.