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Grace did you get this sorted? I am in the same situation. No response from TPG.
Gi GraceH,
I have checked with nbn and noted that your account ( CID: 4756673) transferred to other service provider by nbn based on your request so that's reason your interenet was disconnected from TPG. NBN has transferred service on 5/4/2020. Usually this happen when you have given permission to other provider to switch your service from TPG to them.
regards
JayeshP9.