Hyundai Motor India — gj21ah8957 santa fe dealer wants 3 months to repair

Address:

C 2705, Oberoi Exquisite, Oberoi Garden Ciiry,, Goregaon East, Mumbai City, Maharashtra, 400063

Gj21ah8957 santa fe given to modi hyundai goregaon, diagnosed that ecm is faulty, we accepted to repair the same after company intervention that this is not a normal wear and tear part and company should take responsibility of it.

After one and half month giving me dates every week for next week, yesterday emails me that i would get the car on november 7th so after another one and half months.
Where in the world take a car to repair for 3 months and above all they need advance money to take my car again??
Is this the way customer should be harrassed.
What is the resolution here - i should get a service car if hyundai is not capable enough to repair a vehicle in one and half month..