senior political correspondent looks at taxpayer questions going unanswered. >> it's tax season and many turn to irs for help for describing a frustrating experience. >> i gave her my id. i got to bring this information back. >> he is not alone. an overloaded phone system led to at least five million calls being dropped. the agency says it is no longer offering line by line assistance only basic information. today said agents it's hurting the bottom line. >> estimate audit collection case closures will translate into a loss of at least 2 billion in revenue that would have been collected. they say the taxes they pay are