Vodafone India — not getting data as per scheme

Address:

Faizabad, Uttar Pradesh, 224001

I am purchasing a new vodafone sim and recharge for 1gb data per day for 84 days but after 5 days i have no data left. On complaint to customer care they first commit that i have plan for 1 gb / day data for 84 days but when i told that i am unable to use internet, they told me that your 2 gb data finished. When i have 1gb data daily then how can 2gb data finished.
Please help me.