How would you go about encrypting plain-text emails and technical support tickets? That's the issue. Technical support tickets by nature are plain text or easily decrypt-able so that they can be read by a human. The credit card information was hashed but all hashes can be cracked with effort. I've seen a huge increase in spam to my WHMCS email since the information was leaked. Email address, name, billing address, that's all plaintext.
I suggest taking a read at this news article:
Prodjex is a Kansas City web development company that provides end-to-end web development services for all things web related. Founded in 2017, we’ve grown quickly and provide web consulting services to clients not only in Kansas City, but across the US.