[Resolved]  Vodafone — Getting calls of previous user

I am using vodafone from last 15 years and was very happy with the services. Seeing that i bought another add on number. Now this add on number which i started using was previously used by some lady who seems to be a call girl whose calls I still receive. This is disgusting and totally unacceptable from vodafone atleast. Getting frustrated I gave this number for disconnection but the application never reached the customer care. After calling up the useless Customer care a number of times they tell me to reapply for a disconnection and pay for the current months rent too even though i had applied for a disconnection before starting of the new month. Please help