How to end the O2 contract?

I've followed the procedure of online submission for 'Kundiung'/termination. Today I've also confirmed about the cancellation on the Hotline number provided. I would like to know by when shall I expect the confirmation that my contract will end on the scheduled time which is around 6th December.

It may last a while until you get a confirmation, sometimes it lasts up to several weeks. In my case, I got one after a few days, but there are reports of other clients that say something different.

But after 9th of next month the contract will again be extended for an year. I would hence need a confirmation as early as possible. Do you know any other ways to confirm about the termination status? I would be really grateful.