RTO India — Registration number

Address:

Mumbai City, Maharashtra, 400014

Sir,
My car dealer has paid all new vehicle registration charges to RTO office central Mumbai office on 14th December, 2016. But even after 29 days RTO office has not allotted registration number. I don't understand these days of online transactions why so much delay to allot registration number after all payments are made? My dealer has been told software has changed hence the delay, but I find people who got the cars in January 2017 who have registered cars after December numbers were allotted .Then why people who paid all road tax in December 2016 under old software were kept pending?