Outsurance - Shocking15% premium hike for a Claim Free Client

Being a business client with Outsurance for more than 10 years and being claim free for the past 6 years I just had a premuim increase of 15% with almost no additional cover! This is shocking. A call to the call centre ended in "sorry - this is what is is". I would understand this if I claimed anything, but totally dissapointed. Anyway, my Outbonus pays in April and then its Bye-Bye Outsurance. I will not get ********** and a 15% increase is exactly that.