Cancelling a contract

Hi I have a contract that is active until the end of this October. I want to cancel the contract and do not want to renew, so I tried the ‘cancel the contact’ thing via My Odido. First I got an email that the cancellation request was successfully received and then got another email right away saying that I caanot cancel my subscription. It seems like I can apply for the cancellation after my current contract is completely over and that would be affective after a whole month?? Does this mean that I have to pay for ANOTHER FULL MONTH of November even though my contract is finished in October and I won’t be using any of Odido’s service? I would like to hear about how cancellation process works. Thank you.