Vodafone India — "love tips" activated without knowledge

"love tips" service has been activated on my vodafone no. Without my knowledge and now i cannot find a way of deactivating it. It is really annoying. My account has been debited and it will continue to be debited unless the so called love tips is deactivated. If i try to deactivate it by calling 198 or via sms it says no vas service active. Plese help me deactivate it as soon as possible.