Collected Addresses in Address Books Gone

 My address books were totally gone after my email was hacked around 2 weeks ago. After multiple open ticket items, all expedited, the one address book was recovered. Tech support insists that the Collected Addresses are all gone, deleted from their end.  This is 25 years of essential contact information. How could they retrieve the "address book" and not retrieve "collected addresses" ? Where do I go from here?