Welcome to TPG Community!
The cancellation of the account should be processed by the owner and not the Service provider.
They will need to make sure that the request is coming from you for security purpose.
However, if you are going to port your home phone number to us, the said account needs to be active while the porting is in progress for it to be transferred successfully.
If the account was canceled, then the porting will discontinue and the system will generate a new phone number for your account.
Should you require further assistance, please let us know.