Welcome to the forums!
Just want to make sure your touchpad cursor is still working and we don't need to do more troubleshooting since it sounds a little unusual if both your left and right touchpad buttons are not working instead of just one of them.
I'm located in the U.S. and am not very familiar with overseas service unfortunately, so you probably want to check or wait for others.
If you purchased the unit locally, or can check with any local stores, consider discussing how to get service with them.
Also, contact your local ASUS support or go to the ASUS website below regarding service for Greece if you haven't already.
Good luck!
(select the Europe region if necessary)
https://www.asus.com/support/CallUshttps://www.asus.com/gr/support/Service-Center/Greece