Where Is My Montana Tax Refund?

Like most people I wait until April 15th to file my taxes. I usually use tax software and file my federal and state taxes through e-file. According to the Montana Department of Revenue's website, since I e-filed I should have received my refund within 2 weeks of them accepting my tax return meaning I should have got my refund on May 1st. Here it is May 17th and I am still waiting.

I had big plans for my $428. I was either going to buy a plane ticket to go someplace cool on Memorial Day Weekend, buy a new bike or gamble my brains out in Deadwood! Unfortunately I have to wait... for my own money. Someone tell me how I can charge the State of Montana penalties and interest please? Because you know, if it were the other way around I would be paying them penalties and interest.