Ford India — Servicing of Ford Ecosport

My car went for routine servicing on its 3rd year (13000 km approx)on 04.10.2020 to Banerjee Ford, Durgapur. I would like to mention my car had no issues at all. I was charged an amount of Rs. 7500 for the servicing. A few days following the same my car did not start at all. Technicians arrived and concluded that the vehicle got self locked. They somehow managed to ignite but I really do not understand their logic which said that I must not put it on gear while on rest rather it should be kept in neutral. I drove a Suzuki car for nearly 5 years and never faced this problem. Also I did not face any such problem with my ecosport before this servicing. I just need to know where the problem prevails- is this a result of poor servicing or the problem is in the car model itself. Additionally, the service executives are extremely unprofessional and rude and now I think they are only concerned about money.