@hondakapankhaa... It happened two times with my Honda City Aspire 2012 in last 2 years....when suddenly car won't start in the morning. Both times, it did start after 2 hours or so. Still don't know why it did what it did....and I've not changed its battery till now.
However, I wonder why would you let anyone mess up with your brand new car's original wiring? Mine is as stock as it was from the day one. Only thing I added were the floor mats. No one has been allowed to mess up with its plastics leave alone the wiring. You may already have voided the warranty of your car as tempering of wiring makes warranty void, including the tracker et el.