First Flight Couriers — document not delivered still shown as delivered in tracking

We booked one document under docket no. A991b348320 on 30.08.2017 from hyderabad to m/s. Prem pharma agency, g-1, ganesh apartments, 12, medavakkam tank road, trust square, chennai - 600 012, ph. No. [protected]. On 1.09.2017 the consignee has enquired us abot the document. We have searched in your tracking and found that the same was delivered on 31.08.2017 at 4.30. Pm. Even when the document was not delivered. Even today the same not delivered to the consignee till now. We have sent certain important documents in the envelop. Hence we request you to kindly see that the same is safely delivred to the consignee other wise be prepared to compensate us the loss which we will incur due to mishandling of the document.