Yeah, Pair screwed themselves pretty badly by pulling this trick. They would have been far better off doing something like:
Dear [account_contact_user]
Your website traffic has risen beyond the maximum threshold of [threshold_amt] for the [name_of_level] level of service.
Since we appreciate your business of the last [length_of_service], we have given you a 24 hour courtesy upgrade to our next level of service -- [name_of_next_level]. If, by [end_time] you decide to keep this level of service you must contact our sales center to arrange payment. Otherwise we will have to start throttling traffic to your server so that it remains below the threshold of [threshold_amt] and does not impact our other customers.
If you have any questions about this courtesy upgrade, or wish to keep this new level of service, please contact [account_manager] at [account_manager_details].
Thank you for using Pair Networks for your hosting needs.
Dear [account_contact_user]
Your website traffic has risen beyond the maximum threshold of [threshold_amt] for the [name_of_level] level of service.
Since we appreciate your business of the last [length_of_service], we have given you a 24 hour courtesy upgrade to our next level of service -- [name_of_next_level]. If, by [end_time] you decide to keep this level of service you must contact our sales center to arrange payment. Otherwise we will have to start throttling traffic to your server so that it remains below the threshold of [threshold_amt] and does not impact our other customers.
If you have any questions about this courtesy upgrade, or wish to keep this new level of service, please contact [account_manager] at [account_manager_details].
Thank you for using Pair Networks for your hosting needs.