Thanks for passing on the details, @guorang1!
I've managed to locate your account and it appears that we will need to have our Mobile Team to verify other details, as well as have them to activate the SIM for you.
Are you free to receive a call in a few minutes? If you have an alternate number that we can contact you, kindly send it via private message so we can organise a call back for you.
Sadly I get to step 2, but there is no mobile service to activate. Not a great start.
This is a TPG mistake, so please don't ask me to call customer service and be on hold indefinitely - call me when/if you want me to actually use this service.