Hi Ssblitz,
My colleague has the exact same experience as you with this Pure Concept/Gerald Tang........but his case is even more extreme/worse than yours. A job that should take 2-3mths drag until 7mths....and counting....and still incomplete. A number of the completed works were highly defective. ID didn't keep his words uncountable times despite my colleague giving him numerous chances. Below is my colleague experience......
http://www.renotalk.sg/showthread.php?4319-Very-Bad-ID-Contractor-Pure-Concept-Gerald-Tang