Plannet fitness are theves

I join the gym 2017 and 2018 I lost my job I ask to cancel the contract but they refused a few months down the line they handed me over to siya recoveries, I made arrangements with them and I have been paying every month. Today I get a debit order on my account from plannet fitness, how can I be debited while I’m paying siya recoveries they are theves I’m not disputing that I need to pay them that is why I made arrangements but what gives them a right to double debit me ???? if you have a contract with these people be careful.