Bank Account Feed Discrepancies in Xero

I have recently taken on the reconciliation on Xero for my business and I've discovered Bank Feed discrepancies which I guess are caused by reconciliation errors.

I'd like to have you quote to resolve.

Reconciliation discrepancy on 2 of my Bank Account Feeds.
Bank Account A:
a) Account Transactions: 6815 items
b) Bank Statement: 6598 items
c) Difference between both accounts few hundred pounds

Bank Account B:
a) Account Transactions: 7945 items
b) Bank Statement: 6917 items
c) Difference between both accounts few thousand pounds

We've been using Xero since Sept 2017

I'm not comfortable providing Xero access, so pls advise what you need to resolve this issue along with your quote.

Bottom line is I need a spreadsheet with notes on what I need to do to apply the fixes, be that Delete duplicate transaction or other such that we ensure both Bank Accounts are reconciled to the correct amount.