YOU ARE A GENIUS!!!  Thank you so very much.. it worked like a charm :)   
I'm thinking I should of waited and tried that before I deleted all my invoices for this customer LOL.  Oh well.. there's only 10 of them.
I did what you said and merged the 2 customers.. clicked on verify data and got the "QB detected no problems".. so I did a backup and it breezed through the backup amazingly.
I can finally upgrade to my 2014.
Thank you again.. Your a lifesaver :)