If your cancellation was received too late, your contract extended automatically for another year - thats due to the cancellation being too late.
Despite of this: If you are right now not eglible anymore for the Young tariff, e.g. because you are too old now -or- failed to present the needed documents that you are under 28 and a student, the extension is done by switching to a regular Red tariff (and thus your monthly base fee increases to the "regular" price instead of the reduced price of the Young plans). But this would've also happened with a manual extension - you would not be able to extend in a Young tariff if you are not eglible anymore (being under 28 AND presenting documentation that you are a student) for these special plans and only a manual extension in a "regular" tariff plan would've been possible [and is still possible if you want to].
