The telemarketer will directly address by ur name..ask him/her very politely abt who gave them your no. and address. (they'll resist) when you have finished, tell him/her to hand over the phone to their leagal advisor or the most superior person in office. When he/she takes over...tell him/her that you are recording the conversation and why should you NOT file a case against for calling you without your consent and get their company blacklisted and locked !