[Resolved]  Vodafone India — incorrect postpaid bill

I did not make any isd calls and i am charged rs.1080 for the same. My usual bill amount is 550-570 and this time it's rs. 1866!
Local calls he mushkil se connect hotey hai due to network issues and isd calls ki baat kar rahe hai.
Also i have no relatives/friends or anyone out of india so there's no chance that i'd make an isd call. This is seriously very frustrating. What kind of billing system do you guys have? Customer care says it cannot be reversed. So bad support and very poor service. Extremely disappointed and planning to port my service provider now.