Every single other service that I have ever paid for in my life would have been crediting my account long ago if there were such frequent interruptions in that service until the issue(s) were 100% resolved. I find it completely unacceptable that all we have gotten are apology blog posts and posts simply stating if the issue is currently ongoing or has stopped for the time being. We pay premium prices across the board for everything in this MMO from the base game and expansions, to subscription price, mog station items, and other physical merchandise. This has been an on and off issue now for five months.
My suggestion would be to please consider lowering the subscription prices if you can no longer guarantee the same level of server stability as pre-stormblood had.