Unposting a group to open an item which was write-off as bad debt

I am writing to seek advice on an issue we are facing. When a customer fails to make a payment, we close the item by writing it off. However, if the customer returns, we require them to pay the outstanding amount first. To facilitate this, we unpost and post the maintenance group for item to be open again, which involves unposting of several items tagged to the group, thereby adding extra work for our team.

The other option which we can use is transferring doubtful receivables, however in this case if the customer never show up the item will remain open for good which again is not good option.