Vodafone India — monthly rental increase without any intimation

Address:

560088

My monthly charges were 299 per month and since using this postpaid service from the last one year. Suddenly without any intimation, my monthly charges have been increased to 399 Rs. When I asked Vodafone executive in the Vodafone store(Electronic city 2 branch) he said "Sir I don't know how this happened let me check then after some minutes he said don't worry sir I'll complain regarding this " I said ok. But still, there are no complaints registered. And again I visit the different stores (Kormangala store) same story "I'll complain" but still not complaint yet registered. This is the level of Vodafone customer service? Why did you increased my monthly rental without any intimation and earlier it was 299 Rs now 399 Rs. Please explain.