Its 4 Mbps up to 50GB.₹ 599 plan is a new plan with 2 Mbps unlimited without any FUP.
BBG Combo ULD 1199 is
Upto 4 Mbps till 30GB, upto 2Mbps beyond
Also, 24 hrs. Unlimited free calling (Local+STD) on any network within India.
It gets updated, but after a month or two.I copy pasted the info from bsnl.co.in
It could have been outdated, possibly.