Vodafone India — with out consent or information changed the plan and increased the post paid rate.

Address:

Bangalore, Karnataka, 560023

A) i got the postpaid bill for oct./nov.17, which was increased (Rs.99 to 199) without my consent. When i complained that i would report to trai and would port my number, the customer service staff told me that the charges for this bill would be reduced to earlier one but from this month it would be more (Already the new month has started).
I told that i wish to continue on same plan as in sep./oc.17, but the staff told me there is no such arrangement.
What is this system by vodafone. They are cheating the customers. Without our consent how they change the plan or tariff.
B) a few years ago when i crossed a border from karnataka to maharashtra my balance of more than rs.450 became zero and next few days i could not use my phone. If i recharge, it would go to zero again. On complaint the person said by mistake it went to international roaming.