I note you put your location as Manila. CX is a Hong Kong airline and I would say that kind of response is pretty common in HK so I would be very surprised if you were getting an email from an Indian centre - that seems far more HK to me! Chinese people are very abrupt and factual (and that's the good ones, the bad ones just say "cannot" to whatever your request is and walk away). Live with it. I think the lack of an apology for the cockroaches is far more serious than your professional email exchange, which says far more about you than it does about Cathay.