1)
Here it says that that Melech Ashur heeded Achaz, and killed Retzin. In Divrei ha'Yamim II, 28:20-21 it says that Melech Ashur did not help Achaz!
1.
Malbim: Divrei ha'Yamim teaches that Melech Ashur did not help him against the Edomim and Pelishtim who came against Achaz. He removed only Melech Aram 1 from Achaz.
1
Malbim (Divrei ha'Yamim II, 28:17): Melech Ashur exiled also the 10 tribes.
2)
What is the meaning of "va'Yagleha Kirah"?
1.
Rashi: He exiled [the people in Damesek] to a Medinah called Kir. Radak - Kir is in Ashur - "v'Galu Es Aram Kirah" (Amos 1:5).
