Maruti Alto Lxi — Renewal of insurance

I have purchased a Maruti alto Lxi from Apra Auto, Mahipalpur, N Delhi-37 during July 2006.

During June 2007, I got minimum 100 calls in one month from different insurance agencies for renewal of insurance though I have renewed my insurance from Apra on due time. On enquiring the other insurance agencies told me that they have got my detail from Apra against some payment.
This year again I have already renewed my insurance from Apra but still I am getting minimum 2 calls everyday from different insurance agencies. The caaler told me that they have paid Apra for the detail information.
I have complaint to Apra Mahipalpur last year also but nothing has happened.
I am surprised and facing lot of harassment by different insurance agencies.