Need a key please. microsoft office professional plus 2010

So I apparently had my key stolen? Or maybe I used it too many times but I got new computer and installed my old microsoft office and apparently I cant use my key, Does anyone have a key for it? Please and thanks!!

microsoft office professional plus 2010 is the version.

If you really had a legitimate key, contact Microsoft customer service... If you did not, just torrent it, or use open/libre office.

The problem with contacting them is they ask for proof of purchase and I do not have that at all. I'd rather not torrent a copy.