VAT return - sale with potential bad debt in same quarter

My client made a large sale in April. Their customer paid by credit card.

In june, the Credit card company is trying to recover the money from my client - don't know the full story, seems some problem with the customer.

My client has 'requested' that I exclude the sale & vat from the April-June VAT return.

I'm immediately thinking no way...it all needs to be accounted for. I am aware of the 6 month bad debt rule if you want to reclaim any vat paid, but my client hasnt actually paid any VAT over yet for the sale because the sale & bad debt have occured in the same quarter.

What would you do? leave the Sale & associated VAT on the books & in the return, or remove?

Any thoughts much appreciated.....