Exts.P5, P9 and P13 bills were returned without payment, the Manager of the bank addressed the Head Office of Savitha Roadlines, with copy of Exts.P6, P10 and P14 lorry receipts to find out whether they are genuine, Ext.P18 is the reply received thereafter. It is dated 5/3/1993 and addressed to Assistant General Manager, State Bank of India, Kochi. True, Ext.P18 shows that Savitha Roadlines was not functioning after April 1986 and the receipts being issued by Savitha Roadlines is not like Exts.P6, P10 and P14 receipts produced by the petitioner before the bank. Question is whether Ext.P18 letter is proved. Though PW1 was examined, even the letter sent by the bank, for which Ext.P18 reply was sent, was not produced. Ext.P18 letter is seen signed for Savitha Roadlines by its manager, though his name is not shown. PW6,