This looks like an issue from the dealer, please complain to Tata Motors and they should help you in sorting out the issues. While taking delivery of my car, I saw the rear mud flaps fixed on to the bumper (screws visible outside) and not to the inner wheel arch even after giving in writing to them not to do it. The rear bumper was replaced free of cost by the dealer after complaining the same to Tata Motors. The dealer is supposed to demo you all the features of the car and they have failed to do so. If they had done that the wiper wash fluid issue would have been noticed during delivery itself.