[Resolved]  Whirlpool / 310 Ltr Refrigerator — Thermostat Not Working & No Cooling

i purchased Whirlpool Refrigerator 310 Ltr. Single Door from M/s.Dass Electricals Bibvewadi in 2001.
From day one the refrigerator was having problems.
1) Compressor not getting cut-off after temperature is reached, it is conteniously running. This can damage the compressor & will reduce it's life.
2) Very Low Coling observed.

Whirlpool representative visited & replaced the thermostat & changed the gas in the refrigeration system on 14th Aug.08 but still problem persists.