Airtel Broadband with Static IP gives unlimited bandwidth at full speeds?

Just an update
Sadly my speed has been reduced.I am getting the post fup speed of 512 kbps now.Tried restarting the modem.It increased the speed back for few minutes and than it again goes back down.
 
At the start of my cycle i applied so had 30gb of data to play.used around 80 gb and than this fup came in.
 
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