Wrong Decision to Buy Volkswagen polo

Th issue with this car, engine malware function.1. For solving the issue, I visited the Elite Bangalore service station(1st week of Aug/2016). They did something and return the car to me. Traveled KM is 3231 when the indication came. 2. The Same issue repeated again(engine malware function). Car towing by road assistance(that time I am a vacation with family). The car reached to PPS Motors Hyderabad service station(13/Oct/2016), they find the issue and replaced with new sensors. They took some long trip for testing and they intimated to me, your car ready. Next day I collected the car(31/Oct/2016). Traveled KM is 5634 when the indication came. (this time I have faced good amount of inconvenience with family) 3. The Same issue repeated again(engine malware function). I visited the Elite Bangalore service station(4/Nov/2016). They have returned the car in a week. Traveled KM is 6360 when the indication came 4. Now engine getting leaking, after service as well.