I will never buy any insurance from GIO

I have setup my own company, Webponent just then, so far every things are good. Matthew (my accountant) is really helpful. I got my workers compensation insurance from GIO and they sent me the invoice few days later. I found out that the don't take credit card, therefore I want to cancel it because all of the other insurers does take credit card. They should tell me before I purchase it and told me that I have already accepted the terms and conditions over the phone. I swear, no matter what, I will never get any insurance from GIO.