I-91 North Garage

Came to Springfield on 2/11 for the Rally at City Hall - Great place to park, the I-91 North Garage, but the machine on the way in was not dispensing chips, and the push for assistance" button got me nothing. Leaving, with no chip, I figured I needed to cope with the "lost chip" option: $30.00 instead of th $4.50 it should have been for the 2 1/2 hours I was there. Well, after taking my credit card and giving me a receipt, I STILL go NO Chip to exit with. The "call for help" button again got me no assistance at all. The machine on exit had no "insert receipt" option that I could see. Is this a scam? Only way out was do go the wrong way through the "enter" lane. If I hadn't been trying to do the right thing, I guess I could have saved myself $30. Beyond unhappy with this state of affairs!