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Have you connected a diagnostic tool to the car to check live data? Is your engine temperature gauge getting to the optimum level?
There are various temperature sensors which can go bad due to dust/dirt build-up also, if you have an auxillary pump (found on the side of the coolant tank), this can also go bad which stops the coolant from flowing to the radiator used for the cabin heater.
Ignore the call request.
Do you have an auxillary pump attached next to the coolant tank? (please see pic) The heater system also has temp sensors in all the vents and also a temp sensor outside, any of these going bad can affect the heat going into the cabin.
Have you tried taking it to another garage? This is not a simple diagnosis, it's quite complicated.
Condensation occurs due to the headlight not being sealed properly, the head light is supposed to be sealed unit, that's why the caps for the bulb covers have air tight seals.
There are a few ways in which this air tight seal can be compromised; this can happen at the back of the head light (where you replace the bulbs) or where the 2 parts of the head light are joined, the seal that joins the 2 headlight sections, can wear/deteriorate which can allow moisture to enter. Also, look for cracks, you will have to remove the head light to inspect closely.