QuickBooks 13-Month Reconciliation Cleanup

I have a QuickBooks file covering the last 13 months that still isn’t fully matching my bank statements. Most transactions are already in the system, yet import glitches, duplicates and a few missing lines are keeping the balances from reconciling... (Budget: $30 - $250 AUD, Jobs: Accounting, Bookkeeping, Data Cleansing, Data Entry, Excel, Financial Analysis, Financial Consulting, Intuit QuickBooks)