If you want to cancel your contract with the company, then it is fairly striaghtforward for you to do so. All you have to do it get in touch with Octopus and tell them that you want to cancel your energy supply, or you can contact your new energy supplier and have them do this for you. If you want to move to a pay as you go energy supplier, then it's worth looking at Utilita Energy, who are the best for PAYG deals.