Reliance Communication Ltd — Reliance netconnect+ data card

Address:

383001

I am using reliance netconnect + data card no.[protected] in gujarat.
They are going to launch 4g hence they have terminated high speed of current data card and forcing us to buy new 4g data card which is costing around 899 if we will not by then will not get high speed service on current device.
We already have paid for netconnect + card how can they terminate service for same if they want us to upgrade it should be on free of cost basis or they should provide service which were earlier committed.