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Hey @suemasens71 ,
Welcome to the community!
I am sad to learn that you're having issues with mobile service, you may try to follow the troubleshooting avaible on the article below and let us know how it will go.
Troubleshooting issues with Incoming/Outgoing Calls on TPG Mobile
Regards,
Had the same issue today and also related to no audio did all troubleshooting but didn't help
https://community.tpg.com.au/t5/SIM-Only-Plans/Mobile-connection-has-no-audio/m-p/135757#M7229