I had the same problem, you can sign up but you can never leave.
Qobuz reps in their emails were rude and unhelpful.
Luckily I was able to get Visa to cancel it, finally.
Qobuz charges
I signed up for a Qobuz free trial...I canceled before the deadline...Then I got a bill for $160 that must be a year of service that I don't want. When I contacted their customer service they said they dont give refunds. I contacted paypal and they refused to correct the mistake. I am now in the process of contesting the charge with VISA. The Qobuz website is very confusing and it is impossible to talk to a human being about this problem. It also took Qobuz almost 3 weeks to even answer my complaint...Has anyone else have this problem.