The PKK aren't great (as a Kurd, I hate them), but to compare them to ISIS is just the Turkish narrative. It can be argued that Turkey as a state is way worse than the PKK. But of course, international politics always sides with governments.
I assume you mean those same teachers that were telling Kurdish kids: "Kurdish is bad", "Do not speak Kurdish", "Ne mutlu Türküm diyene!" (English: "How happy is the one who says I am a Turk!"). (PS. I still think it is wrong to kill teachers, no matter how hateful and racist they may be).
The PKK exists because of Turkish actions against the Kurds. Period.
Turks would say: "Nah, that was in the past, we love Kurds, I have Kurdish friends", but it is mostly lies: https://www.youtube.com/watch?v=EhXCNuXiJZU (some Turks might do of course, but in general, Turks hate Kurds)
Don't get me wrong. A Kurd can be happy in Turkey. If he basically acts Turkish, lets go of his Kurdish culture and customs, and loves Ataturk (who forced Turkish surnames on all citizens of the "modern Turkey" and changed the names of thousands of Kurdish towns and villages from Kurdish to Turkish).
There are many Kurds in Turkey that are happy. However, these don't speak Kurdish. They speak Turkish in the family, they speak Turkish with their kids. To other Kurds, they are basically Turk.
In my opinion, one reason Turkey is invading North Syria (the Kurdish region - aka Rojava) is because the Kurds in North Syria are Kurmancî speakers. This is the same dialect of Kurdish that is spoken by the Kurds in Turkey.
Kurds in North Syria speak Kurdish at home, they watch Kurdish TV, they go about their daily lives in Kurdish. They watch Kurdish plays and listen to Kurdish music and since The Autonomous Administration of North and East Syria (AANES) has been a thing, the Kurds in Syria are studying Kurdish from year one all the way to college. This revival in Kurdish literature is really scary to Turkey because it lights a fire in the Kurmancî speakers in its territory. It shows the Kurds in Turkey that being a Kurd isn't bad, it shows them that Kurds are a people with a rich culture and it is a shame to let that go.
Turks would argue that no, we invade the Kurdish regions in Syria (see Efrîn/Afrin) because the people of The Autonomous Administration of North and East Syria (AANES) are the other side of the coin of PKK. Personally, I think that is bullshit. Turkey moved 1000s of ISIS members through its borders and helped them attack the Kurds when the Kurds were fighting ISIS.
Basically, Turkey has and is making a demographic change in Efrîn/Afrin, they are driving Kurds away and putting Arabs there. Then they'll say "come and look, there are hardly any Kurds here". They now want to do the same to the rest of North Syria.
Nothing scares Turkey more than Kurdish nationalism, which only gets stronger by Turkish aggression. You'd think they'd learn this by now, but no.
If in Turkey, Kurds are allowed to study from nursery to university in Kurdish, and if they truly get considered as Kurdish citizens of Turkey with no racism or oppression, then Kurdish national sentiment would die out.
The price is extortionate in my opinion, you should have 100% used a good, solo freelancer.
And I'm shocked at how long they took to deliver that. This whole thing could have been done in a 2 weeks, a month maximum.
Take it as an expensive life lesson and I hope your business does so well that many years into the future, you laugh about this whole incident.