Vodafone India — unauthorized debit from my balance

Address: Chennai, Tamil Nadu, 600082

In my vodafone sim there have been series of debits made without my concern. When contacted the customer care, they are stating it to be vas charges. I did not use any such vas service. When i said the same, they reverted back the charges and upon my request they blocked such services on my number. But even after that, this is happening again and again. When i raised the issue even after refund to know what service that i am being charged for, they are stating that they cannot access the service details due to security issues. I don't want such debits to take place in my account any further. Raising this here as i am unable to get no further assistance from vodafone (Apart from what stated above).