You had the option of taking either the VCP6-DCV exam, or the special VCP6-DCV Delta exam prior to your deadline - path 1 on this page: VCP6-DCV Certification

You will now need to take training, VMware will permit you to take a shorter (and cheaper) What's New class, rather than a full class, if you wish - that's path 4 on the same page: VCP6-DCV Certification

Or, of course - you have the choice to stay expired.