I'm sorry that your time was wasted in a video game that's labeled as an MMO.
Personally i don't go into grinds on any game let alone MMO titles expecting to receive any rewards or benefits when things get tweaked or altered, balanced, whatever word you want to use. You got the intended reward at the end and there was no bugs or things that weren't working as intended at least AFAIK in this little tablet grind, so why would you expect compensation?