It’s not allowed to leave Indonesia after applying for the DTV there. If they find out they will void your application.

Best thing is to contact the embassy whatever way you can, by phone, in person, email, Facebook messenger, to check the status and to ask if you can get a response before.

If you get to 12th and haven’t heard from them and you don’t want to risk a visa overstay (and have to leave).

Then before you travel, take a photo of every page of your passport (including blank pages) in case they ask. They do this to prove you haven’t left the country. But ultimately it’s not an ideal solution, as they will then expect you’ve overstayed your visa. And they sometimes ask for date stamps on photos too

Good luck!