Honestly, IF they were to do any refunds for your purchase of a Purchase To Pay I'd expect to see gamekeys deactivated or just as simple, banning the account that has a refund for initial purchase processed on it. Especially if you purchased Premium Time for alts via real money or in-game currency and you're still active for a game purchase refund.
It's not logical or fiscally responsible for them to refund you just because of the issues that have been happening. If you liked the game but turned sour because of the initial launch issues (which we were seeing a lot of progress on) and then right after the DDOS attacks that have caused the major amount of downtime giving you Premium is still essentially going to cost them money overall. Just like these DDOS attacks have. Hiring NetSec, SysSec, and working with the DC the servers are in is NOT CHEAP. It costs a lot of money.
TLDR: Be patient and deal with the downtime as they fine tune everything for the DDOS, and try to think about it not from just your perspective. The world does not revolve around you.
I guess my main point is, I purchased this game and have not been able to really play or dig into it. At this point, I don't know that I even want to. If an option were to present itself where I could de-activate my account and get a refund, I would take it.