Westpoint fridge freezer?

called the technician as my fridge was stopping and not restarting on its own. First he charged me to pipe some gas as he said it was lacking in gas . still not good came again to change the timer. Again charged me again.still not working now he showed me to switch it on and off manually as he said that the fridge had no thermostat.or else it is hidden somewhere !!! Can anybody tell me where the thermostat of a Westpoint fridge freezer is as this is costing me a fortune I wish i bought a new one.