As far as I can tell they have multiple call centers around the globe. So if you are calling from HK in the middle of your day it will not get routed to a US call center in the middle of the night here. My guess is you got to a center in India or closeby.
While interesting your curiosity of the call center, it is confirmed that not in the USA for cost reasons - technically, the agents are supposed to be nice and objective but you got a "chatty agent" hah. As long as your account is in good standing though...