Vodafone India — incorrect charges on my postpaid bill

Hi can see a wrong charge of rs.2500 which is mentioned as exit fee for a plan which i have never opted for. I want a refund for that. I will not be able to pay my postpaid bill until then. As soon as i received the sms with my bill details, i tried calling the call center but the call was never connected to any executive. I have been doing this for the last 3 days. Today my call got connected to an executive who sounded least interested in talking to me. He was very unprofessional and also mentioned that their systems are down and he cannot do anything.

I have been loyal customer of vodafone for the last 10 years, and is the kind of service i get for being a loyal to this brand. My details are as below
Mobile no - [protected]
Bill amount - 3749
Refund amount 2500