Unauthorized lines added to my account

I purchased and paid in full an iPhone and activated one personal line. Upon receiving my monthly invoice, it shows a total of four lines that are on a business plan. I did not authorize this; I do not have a business nor a need for three additional phone lines. The ATT employee who activated these lines without my knowledge, surprise-surprise-no longer works at the store. I have filed a fraud claim about 4 weeks ago and have heard nothing-zero, zip, zilch. AT&T has since locked my paid-in-full iPhone. I have spent countless hours on the phone with AT&T Customer Service and hours upon hours with the in-store manager, who has tried her best and was able to obtain a partial credit. Why am I being put through the ringer when your employee fraudulently added these lines to my account without my knowledge, permission, and/or signature?!? I have a receipt showing payment in full of the phone and a single line activation. Come on AT&T, get this fixed. Unlock my phone and correct my invoice!