If you have paid for one month and were activated on August 5th, then your expiration date would be September 4th. If you paid 3 months, then your expiration date would be November 4th, etc.
Service is based on a prepaid system.
It is your responsibility to submit payment before the expiration date. If payment is not received after a grace period of 3 days, the account will be temporarily suspended. These suspended accounts will not be reactivated until the payment is received or authorization for a credit card charge is given. If you are paying by credit card, you will be automatically charged at the end of each billing cycle for your account. If the customer cannot be contacted, then the credit card will be billed.