Kelvinator fridge cools continuously?

i have a kelvinator fridge 180 L purchased in Apr 2007. it now cooling continously to such an extent that even in vegeatabel section everything gets freezed into ice..water bootles also become ice filled bottles...i feel thermostat has stopped working. i feel compressor remains continuoisly on...i have to switch off fridge after every 2-3 hrs to control overcooling...
please tell me what to do..and suggest me kelvinator service centre in Kanpur near rama devi chauraha or COD crossing, GT Road.