Welcome to the Community!
We've created a self help option through our Support website. Check this link.
This will help our TPG AU Mobile customers troubleshoot the issue with their service.
If the issue persists, please send me a PM with your Mobile number or customer ID number to assist you accordingly.
It would seem that your concern is related to TPG Singapore and not TPG Australia. In this case kindly send an email to Singapore Mobile Team at firstname.lastname@example.org or visit their Facebook Page at https://www.facebook.com/TPG-Singapore-785533401811953/ for assistance with your concern.