Indian Overseas Bank — Deposit

I have a deposit receipt datesd 2/91 fcnr deposit
I can not recollect cashing it at any time I had this deposited at calicut branch Some how it has been sent to kottayam branch by the bank manager I have made enquires at kottayam branch no one could help me there The calicut office can not trace any such deposit the cjhennai head office on phone advised me that this deposit can not be traced as it is very old
The following are the details of the receipt I have I am now retired person settled in uk RDP/47/91
deposit £4408

period 36 months
Interset rate 7%
due date 21/8/97 Iam very dissatisfied with the attitude of the customer care at calicut and chennai
so far
I wonder if you could kindly trace this receipt and advice as soon as possible I realise these records could be manual at that time
Thanking you