Contact page https://www.paypal.com/us/cgi-bin/helpscr?cmd=_help&t=escalateTab.
PayPal provide several methods of contact including online chat.
PayPal Customer Service to resolve the payment problem:
(65)-6510-4650, (a Singapore telephone number), 9:00 SGT to 18:00 SGT from Monday to Friday
Paypal office in Shanghai China:
86 21 28913888, 8:00 to 22:00, Beijing Time