Moove won't cancel my contract

I signed a 24 months contract with them, they kept on deducting the money even after the contract has ended. I stopped the debit order and now they telling me the contract continues on month to month bases after the 24 months. The contract states clearly that it starts 23 September 2023 to 27 September 2025. Now I'm struggling to cancel they say I must cancel on the app but when I try to go into the app, it's blocked because the debit order didn't go through now what must I do