Hello,
I've got about 4 accounts that would be billed for DID every day (with monthly billing configured), in most cases depleting the balance of the customer.
This seems to happen to prepaid accounts I had before I updated from 3.0 to 3.5. I have looked at the astpp database, but cannot find anything common to these 4 accounts.
I have also checked the cron configuration and I've got

Generate Invoice

0 1 _ _ * cd /var/www/html/astpp/cron/ && php cron.php GenerateInvoice

1. Low balance notification
   0 1 _ _ * cd /var/www/html/astpp/cron/ && php cron.php UpdateBalance
2. Low balance notification
   0 0 _ _ * cd /var/www/html/astpp/cron/ && php cron.php LowBalance
3. Update currency rate
   0 0 _ _ * cd /var/www/html/astpp/cron/ && php cron.php CurrencyUpdate
4. Email Broadcasting
   _ _ _ _ * cd /var/www/html/astpp/cron/ && php cron.php BroadcastEmail

Any help will be appreciated. I have had to manually replenish these accounts everyday.