Get online support
Refer to this: https://community.tpg.com.au/t5/Accounts-and-Billing/Moving-your-TPG-services/m-p/17838#M1298
If you can get through to someone, ask them for a refund (based on the number of days you are not using the service). Hopefully you can resolve your issues sooner or maybe wait until COVID dies down and everything goes back to normal.