I tried a free trial of cbs all access for $5.99 a month and thought I cancelled it. Months later I saw they were still charging me and i attempted to cancel the channel again and thought I had succeded, but they keep charging me! No matter what I do I'll be paying that $5.99 for the rest of my life. I've tried calling, email and am about to delete my account entirely.
A word to the wise don't subscribe to any Roku Chanels through Roku. It's so user unfriendly you'll be doomed to pay that subscription forever!