You will have to start over. Bungie doesn't restore lost or deleted characters or items. Most likely a hack, I would recommend changing your password.

Unfortunately, Bungie doesn't replace or restore lost/deleted characters nor will they replace any of the items that were deleted alongside your characters. If you believe your account has been compromised, Please follow the link below to increase the security of your account and prevent future breaches from happening. [url=http://www.bungie.net/en/Help/Article/12718]Keeping my account safe[/url] [url=https://www.bungie.net/en/Help/Article/12240]Character Restoration Policy[/url] [quote]Whether due to accidental deletion or unauthorized account access, we recognize how upsetting it is to lose the character and gear you’ve put time into. We take reports of character deletion seriously and investigate cases of missing characters. In each instance we have investigated, missing characters have been the result of a manual deletion. [b]Bungie does not recover manually deleted characters or items[/b].[/quote] [url=http://www.bungie.net/en/Help/Article/12211]Bungie's restoration policy[/url] [quo te]The following services cannot be provided: Recovery of dismantled/scrapped/deleted/discarded items* Reset character features Transfer of items between platform accounts Reset or refund weapon and armor upgrades Refund currencies on accidental purchases Revert Exotic Bounty choices Refund materials on accidental reforged weapons [b]Restore deleted characters[/b][/quote]