Initially the male voice asked to speak to "Ms Charlie". When I asked who's calling, they launched into Mandarin and said they're calling from Costco Customer Service. I asked them to speak English and they hung up. Highly doubt this is legitimately from Costco. If it is they need to fire the dweeb who cold calls customers and can't speak a full sentence in English.

I called back the number (02) 9469 7999 and reached vm that said I reached Costco Australia