Welcome to the Community!
Though we hate to see you go, we understand your need to cancel. I was able to check your account using your community details as reference. Your billing cycle starts on the 4th of the month and ends on the 3rd of the next month. Since TPG is a prepaid service, payment is deducted from your account 7 days before the start of the billing cycle. So the payment you made on June 27th is for the billing period of July 4 - Aug 3,
It appears, though, that you have already sent the email indicating August 3 as your last day. Let me know if you need further clarification.
Thank you for staying with us for the last 2 years. We hope you can reconsider us in the future again.