Unauthorised Debit Order

I had a contract with the company for the past two years, my contract ended on August 2024 but to date the company is still billing me for the expired contract, Reference: OA-***0-1. I received several messages as a reminder that my contract is expiring and that August will be the last date for the debit order to go through. Afterwards, the company pestered me with requests to renew the contract with unending WhatsApp messages which I declined everyime the message popped up. I once reversed the payment , disputing the debit order, but the following month they still debited my bank account, to date. May you please help me to retrieve all the money that has been deducted since September 2024 to be refunded and henceforth stop them from debiting my account for the expired contract.

Regards Mpepele (Sethokga)MM