What is the process for cancelling a non-B visa and work permit in Thailand?

The process for cancelling a non-B visa has changed; now the visa must be cancelled first before the work permit can be cancelled. The HR manager needs to provide a photocopy of the passport with the cancellation stamp to the Ministry of Labour for the work permit cancellation. This may relate to a memo from late 2017 that requires employers to report to immigration the day a foreign employee ceases work.