Vodafone — Data usage automatically loosing very fast.

Don’t know if people are noticing it or not but from 2-3 months Vodafone idea data is getting used very fast. I was watching youtube video at 360p and it uses 100mbs for every 10 min video means that i am able to watch 3-4 videos and it will consume 2 gb easily. Is this some type of scam or what to attract people to buy more priceable monthly plan!?? Support this complaint everyone who is facing same issue.