Hyundai Motor India — i 10 stalling and failing to start. takes three to four cranking to start the engine.

My car had a problem of stalling at idlling time. I took the car to the local mgf hyundai. Initially they said there is no problem with the car. After a week i went there again. The said the engine is overheating. They said that the radiator fan and motor are bad and they renewed it. When they handed over the car, the condition was worse. My car never had starting problem but only had the problem of stopping at idling.
Now they are saying the car engine needs overhauling. This car is i 10 2009 model ans has done only 45000. Km.
Should i replace the ecm or do the engine overhaul.