CALLING AGAIN AND AGAIN.

I AM FROM GURGAON MY MOB. NO. IS 98734979.. AN IDEA MOBILE EXECUTIVE CALLING ME AGAIN AND TO CONVEY THE MESSAGE OF BILL PAYMENT.I TOLD THEM THAT I DONT KNOW THAT PERSON THAT MUCH, I DONT KNOW WHY HE GAVE MY NO. AS AN ALTERNATIVE MOB. NO.
I TOLD THEM BUT THEY CALL ME CONTINOUSLY.
I JUST RECIEVED A CALL FROM RADHIKA MOB NO. 8512846835(IDEA EXECUTIVE)
I TOLD HIM NOT TO CALL ME AGAIN BUT SHE SAID SHE WOULD CALL UNTILL THE BILL IS NOT PAID.
SHE IS GIVING ME ATTITUDE THAT YOU HAVE TO CONVEY THE MESSAGE..