SIM CARD — sim failure

I HAD PURCHASED SIM NO.[protected] IN MAY-2007 FOR RS. 600, A TO A RS. 0.25 AND A TO OTHERS RS.0.50.WITHIN ONE MONTH IT FAILED. I SENT MANY LETTERS TO YOUR PAREL OFFICE, I VISITED YOUR BORIVALI GALLARY SO MANY TIMES, IN LAST TWO YEARS, THEY USED TO REPLY, GO TO PAREL. PL. LOOK INTO THE MATTER AND SEND ME THE ANSWER ON THIS EMAIL. THE MOBILE NO.GIVEN TO ME WAS [protected]. AFTER FAILURE MY SIM, THIS NO.WAS ISSUED TO ANOTHER CUSTOMER. THIS IS NOT THE MATTER OF RS.600, BUT THE NAME OF COMPANY.