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Hi @samhickson
You can access your account statements via the online account portals.
The $20 charge is a ''phone pre-payment'' for voice usages outside of your plan. It will cover any call charges and normally automatically re-charges once that balance is under $10.
Any un-used pre-payment charges will be refunded to you when you end your service with TPG.
It is noted on in plan details.
Regards,
David_M