Maruti Suzuki India — About rto passing and selected number

Address:

Rajkot, Gujarat, 360001

We bought a new maruti suzuki baleno car from atul nexa rajkot.
At the time of purchase i told him that we want a selected registration vehicle number from Rto.
At the same time he wrote the wrong address in the rto registration process form. Now we dont have that address proof. So we told atul nexa to solve this problem. Mr. Bhargav (atul nexa rajkot) take 1.5 months to resolve that problem. Now rto morbi told us that u passed the time to select the number.
Atul nexa rajkot raise the hands and told me that this is not his fault.

So pls help me to resolve the problem.