Until the 19th of March TK was telling people either that it would take 45 days or "up to" 45 days to get their refund. They had been saying this for about a month up until that point, so I find it really strange that they would have said "30 days" at that point, whether the law had been made or not. As for whether you were informed or not of it, for all we know you asked for the refund 1 minute after midnight, and maybe the call center person that you spoke with was not briefed. You seem to have been a FT member for a decade, it was widely posted here almost instantly what the new rules and regs were when they came through, and by 5Pm at the latest that day it was in fact posted on their website, not to mention any other reasonable place.
That being said, whether its July 21st or September 21st or whenever TK has actually promised you that you will get your money back. TAP has made you no such promises and the majority of large European airlines are acting in illegal manners in forcing people to take vouchers or whatever and flat out refusing any sort of refunds. Yet it is TK that you will refuse to fly in the future??! That's nuts!
I am the first one to criticize TK when they do something wrong, and have been quite open in telling and speaking about how whatever Turkish law they site means little or nothing in many jurisdictions when being applied in a retroactive manner. That being said, TK has acted with far more honor towards their customers than 90% of the airlines out there. they were the first to offer several other "bonus" options as well as (delayed) refunds, that have been widely copied,and deserve full credit for their pro-customer stance in these times. So you aren't going to fly TK anymore, because your money is delayed? Fine, go fly TAP who probably will never ever give you back a cash refund?!?!?!