Possibly not. Once your case gets reverted to the PCN stage, penalty reverts to that, so the 50% increase for the Charge Certificate is no longer payable.
Your case is what is called a "drive away", and is specifically dealt with in the Traffic Management Act 2004. This allows a CEO who had started to prepare a PCN for service to car or driver, but the driver drove off before it could be served, to record a 'drive-away'. The council can then send a postal PCN to the registered keeper. Hence we need to know what document you received in the post.