Even after canceling or porting your Verizon line, you'll receive a final invoice summarizing any remaining charges or credits.
Go to My Verizon and sign in to your account
Go to Billing → View bill history
Download the PDF of your final statement for your records
Yes, once the account closes.
Contact Verizon billing support within 60 days of invoice.
Access your Verizon billing history or contact support for assistance.