my refund status

i filed my taxes e file was accepted on February 12 and i cant get ahold of the irs or anyway to find out it has been over 30 days and on the irs website says still processing does anyone have any idea why it is taking so long and also i heard if they dont give you  your refund in 45 days it collects interest i also tried to call irs just keeps hanging up and i am very frustrated