I always found the research email to be super efficient, although they don’t always respond saying that it was credited, most of my requests are credited within 24 hours if not faster.

maybe request the credit directly with hotel?

I’ve also found calling overseas call center like Hong Kong or Singapore directly on Skype gets things done quicker. YMMV.

Having said that, and back to your original question, I don’t recall ever getting a non-North American rep when calling the titanium line.