Hyundai Motor India — damaged car ecm

Address:

Bannerghatta Road, Bangalore

I gave my grand i10 car for servicing at advaith hyundai, bannerghatta road, bangalore on 03.10.2020.
They committed me that they will deliver my vehicle next day by evening i. E. 04.10.2020.
My concern was engine malfunction symbol appearing in dashboard, “reset” and “mode” switch in steering is not lighting up when i switch on the lights.
They told me that o2 sensor is not working hence it has to be replaced to rectify the engine malfunction light in dashboard. I said ok replace it and i gave rs.6000/- advance also for it.
But next day i. E. 04.10.2020, service advisor told me that my car jerking a lot and to be checked. Hence, will not be able to deliver it. While giving the car for servicing, there was not jerking. I travelled 700+ km in previous sunday that too in highway with more than 100+km per hour speed. I didn’t feel any minimal jerking also. After lot of conversations with service advisor he told me that they needed one more day to rectify the problem. I needed to go to my native kerala on tuesday i. E. 06.10.2020 which is 450+ far from bangalore. Hence i told service advisor, you can take one more day but not definitely more than that. Monday they called me and told that it seems like i am using local petrol and oil hence engine might have problem. I said, i changed engine oil and filter a month back. I have put bosch’s filter.
I use only shell petroleum premium. How come it became local petrol? Then he said, ok sir will check again and come back. Later in the evening he called me and said, he cannot deliver the vehicle as he was not able to find out what is the problem and moreover he said 1st and 2nd gear is lagging a lot.
Now whatever i planned to visit my native got cancelled due to inefficiency of service station.
I cancelled all my personal arrangements which caused me a lot of mental depression and financial loss.
I asked final date to deliver my vehicle, then he confirmed that he can deliver on 07.10.2020.
Next day on 06.10.2020, he said that my car ecm is short circuited. I need to pay rs.25000/- extra than estimate given for rs.17000/-. I said, do not do anything and give back my car as it is.
They delivered my car on 07.10.2020 afternoon.

I gave my car for service in good condition. Now my car ecm is damaged at service station and they are offering me emi options to replace it. Moreover they are telling that they cannot assure electrical wiring and anything can happen any time. Is this the way to communicate to customer? You people will damage my car and will give emi option to repair it? Please do not make fool out of customers.