Welcome to the community,
Could you please send me a PM (private message) with your Full Name, CID (customer identication number) and your mobile phone number, so I can take a look at your service?
If you put your old mobile providers SIM back in you mobile is the service still active? Are you able to insert your old SIM again, or provide another contact number for our Mobile Team to contact you back on please?
Welcome to the Community!
We've created an online help support guide that will help you troubleshoot the issue with your TPG SIM service.
You may check it here.
If you are still experiencing issues with your TPG SIM service, please send me a PM with your customer ID number or mobile number to assist you accordingly.