Nexa — bluetooth of baleno zeta diesel is not working

Address:

124001

Respected sir/mam,
I have baleno diesel zeta model, purchased on 6th septmber 2016. Bluetooth device is not working since last 7-8 months. When i contacted showroom, they said software of bluetooth of car has to be upddated.
As no separate service center of nexa is available at rohtak, i went to jagmohan maruti service center. But unfortunately they donot have the solution of the problem. I was asked to come again, during my second visit, they made bluetooth contacted to their own 2-3 phones, but not able to contact it with my two phones. And they have no solution.
Please help me.
Thanks