Dear all
If all of you are using Tally software for accounting then please note that you can get the same from that. To print a confirmation letter from tally you have to go to ledger account of concern party then click print option and now you can select the option in Option 1 > ledger account or > Confirmation pf account, select confirmation of account and fill other information as required and take print of that.
You can also change the drafting of this letter throgh using F12