Unsubscribing from probiller.com service

I want to unsubscribe probiller.com because it costs me over £90 pounds and its way too expensive i did though the phone call of probiller.com website but I'm not to sure the company did it or not because I can't see this bill anywhere I'm worried if probiller.com change me a very expensive bill again

[Re-Titled by Moderator]

Original Title: Unsubscribe probiller.com