Repair kebab machine - temp knobs

Sin requested 3 quotes from Appliance Repairmen in Mentone

Some of my temperature adjustment knobs arent holding down (no gas coming through) however works when held down

FIX F & P OVEN - MAY BE THERMOSTAT
FIX F & P OVEN - MAY BE THERMOSTAT

Nardi gas stove need repair. 3 of the hot plaits are not working.
Nardi gas stove need repair. 3 of the hot plaits are not working.

Repair my airconditioner
Air conditioner make/model: Lemair rotary C180. Not working at optimum...

Repair gas water heater
Gas water heater has stopped working. No pilot light. No flame.