You could just open it in libreoffice, make your changes and send them back an ODT, see how they like it.
Or demand a PDF and list out the things you want to change so they can change it themselves.
> You could just open it in libreoffice, make your changes and send them back an ODT, see how they like it.
We didn't, and have decided to go with someone else who costs three times as much as you do. It's a bargain after the dozen internal emails back and forth, the missed deadline, and the subsequent heated discussions with you that your ODT caused. We know they aren't as good as you are.
> send them back an ODT
The formatting goes wonky or the macros stop working and you get the blame for doing something "weird" to the document everyone else managed to pass around just fine.
As much as you're doing the right thing by using open formats, you still end up looking like the incompetent employee. No good deed goes unpunished.