Postal — Not delivering my phone bills

Sir, Our address Santhipuram p.o. Nedungadappally Karukachal thaluk 686545 pin code kottayam district Kerala I need to file a complaint against my postwoman.She is not delivering my phone bills since an year. I have called my phone customer care unit but they told they have sent all the bills. I asked about this to my postwoman 8 months before. She told she used to deliver our letters to one of our distant relatives house. I really could not understand why she told like that. Then I asked her to bring next coming bills to our home itself. But again the samething she is repeating. Untill now we havnt received anybof those bills