Although no action is possible on canceled orders, Amazon provides sellers with basic details about these orders so you will have a complete record of buying activity for your items and the ability to manage your sales and inventory levels effectively.
Canceled orders are "complete" as the "pending" stage is resolved. While some orders are canceled by a buyer before they enter the processing stage, other orders are canceled by Amazon after hours or days of processing. You can correspond with a buyer till their order is canceled. If the buyer has questions after their order is canceled, direct them to Amazon customer service.