Re-installing Mavericks from recovery temporarily unavailable. Also can't download a new image
Try getting the Mavericks Installer from a friend how can also upload it to a Google driver for you.  Then you create a bootable USB with Mavericks on it.

I did that for my friend who is in Europe while I am in USA and it worked.

Once you have the Mavericks Installer...

create Bootable USB

Format it, using Disk Utility, as a Mac OS Extended (Journaled) drive, named Mavericks. 

This can be done from the Erase tab within the app; make sure the USB drive does not have multiple partitions (that can happen, so turn to the Partition tab to verify and correct this).

Open Terminal.

sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/Mavericks --applicationpath /Applications/Install\ OS\ X\ Mavericks.app --no interaction.