Due to billing software problem in Calcutta Telephones, there are a substantial number of Dataone bills are erroneous. The billing department has sent the list of erroneous bills to the respective Office of the Area Manager. They are sending the revised bills by courier. The due date for the bill has also been extended for them (which is mentioned in the revised bill). But this does not necessarily mean that your bill is also erroneous. Please contact your Area Manager Office or AOTR (Accounts Officer Telecom Revenue) for clarification.
Actually, what happened, in the bill the total charges of Broadband is given once and the brake-up for the same is also given. When making the grand total, these were counted twice. This is a software error.
One more thing, fancy number for BSNL mobile (ie, cellone and excel) are chargable, not landline numbers. I made a mistake. Sorry.
Have you checked your call details by registering with www.calcuttatelephones.com ?
You can also use dynamic locking for restricting your calls.