Cheque to supplier unpresented to our bank

In December 2018 we paid a supplier for goods received using a cheque.
The cheque has never been presented to the bank BUT according to the supplier’s we do not owe them.
So it continues to show as ‘unreconciled’ on the bank reconciliation.
We had an end of year audit 31st March 2019 so do not want to go back beyond that date making changes.
Suggestions would be welcome.

Contingent Income inside P&L. But only if they write you officially that your debt is completely closed.

ask supplier for balance confirmation once it is confirmed you can proceed with @Davide reply

Thank you for advice - will implement .