Vi — Automatic activation of caller tune and deduction of balance

This has happened twice until now. I tried contacting the customer care the first time it happened, but was not able to connect to anyone as all the responses were automated. 30rs was deducted from my balance. I deactivated the caller tune from the Vi app. Now again it happened and since there was only 2rs balance on my account 1 re is been deducted. I have deactivated the service. I would like to have the refund of 31rs.