Cancelation nightmare

This is a good company, but what I find most irritating is the way to communicate. There is no email address to be found either on their website or their app. The problem I have with this, is that I have no prove of communication with them, than showing them I phoned them. I can't keep record of my communications with them that way. I'm trying since yesterday to call them to cancel my policy, but keep disconnected after the machine told me all lines are currently busy. I've requested a "call back" on the app twice already and no one is calling back. I WANT TO CANCEL MY POLICY, PLEASE!