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The head gasket.

After a routine service the garage reception tell you that your head gasket has begun to leak and needs immediate replacement. This job on a modern car can be an expensive undertaking, as besides replacing head gasket, associated parts may also require replacement. The timing belt will definitely require renewal; water pump and thermostat may also be due for replacement at this time. The cylinder head will need checking for flattness and possibly skimming to ensure mating surfaces are completely flat. New cylinder head bolts should also be used during reassembly. Oil and filter should also be renewed as a matter of course.
Finally to make sure of a successful outcome any suspect radiator and heater hoses should be renewed the radiator should be removed from the car, for flow and pressure check for leaks, if there is any doubt this expensive item should be replaced.
Unless these items are checked or replaced at this time, replacing head gasket will be a waste of money as problem will recur after a short period, and you have been conned.