Vodafone India — Added 45 Rupees in my bil

Address:

Chandigarh, Punjab

Last month vodafone unnecessary activated some service on my number. within 5 min i called customer care and asked them about it. They told that it had been activated accidentally and terminated the service. But when the bill came they include 45 in it. Now i have been trying to contact them but no response from there side. Let me know what all option I have ?