I did volunteering activities via Humanitas. They ...

I did volunteering activities via Humanitas. They would refund the travel expenses, which they never did! When I emailed them, they would tell me that it is done, but that was nothing but a lie. I emailed them too many times and after 2 months, I gave up. Luckily, I quit and I advise all potential volunteers not to join this volunteering organization...nothing but slacking, lagging and lying...