As a workaround I was buying annual ticket from the ticket machine at the platform, which then printed all 12 tickets in advance... but hell... why every alternative has to be so obnoxious.
You might want to check your online banking portal thoroughly. I stumbled by accident over a semi-hidden place in mine that listed every SEPA Mandat and let me revoke them
This doesn't cancel the subscription. Now get ready for a furious avalanche of increasingly threatening letters and accumulating fines.