If it is not impossible for you to change your mobile number, just send them a letter to the 'street dog' Vodafone customer care informing that you are going to discontinue the connection if they continue doing like this. Also give copy of your sms and other references to consumer court. Vodafone is like a dog which they show in ads but a street dog as far as my experience goes and I have discontinued their line and switched over to Reliance with excellent connectivity and service.
