If you create a new contact property with the same internal value name, the information will come back. The property is not deleted, it is just no longer available in app, so if you essentially call it back into the app by recreating a property with the same internal value, the information will repopulate.
I can see you are working with the HubSpot Technical Support team regarding this matter. Continuing to partner with the Support team will be the most direct way to resolve this matter.
Hi, I have had a similar issue take place. Only thing is, I am unsure who deleted the properties. I just tried to re-create the property with the same internal value but the values did not appear.