Sirus wasn't bad, but it was still a call which is annoying.
The worst I've experienced was equifax. I signed up for a free trial to see where my credit sat and what was up, then cancelled. It was a phone call, 30 minute wait, and SUPER weaselly behavior in the call center script. Something to the effect of Them: "Hey we want to give you this free gift", Me: "Will that gift keep my subscription active?" Them: "yes". Repeated several times as they tried just a bunch of avenues to not cancel my account. I literally had to say "No, I just want you to cancel my account" or "Are you going to cancel my account" like 20 times. It took over an hour.
