Vodafone India — Very high amount charged for extra data use

Address:	560027
Website:	Vodafone

I activated the offer of 8 gb/ month for three months. I used 256 mb extra and for that they charged more than 1000 rupees (4 rupees for each mb). Since using 4g it's very difficult to control how much extra mb used. Since providing 8 gb free offer and then charging very high usage charge is not ethically correct. I complaint several times using mail and call but they just informed how they charged the extra amount.