Ask Alliance One to give you the details of the account in writing because they must follow the fdcpa law. Moreover, this account is past the SOL period. You just don't have to pay anything even if they can prove it to be your account. You must be sure that you never made any sort of payment in this account within the last 4 years.
Use your legal consumer rights mentioned in the FDCPA. Calls can't make them get money from you. You can expect them getting harsh on you as they often do. You can take legal advice from your attorney.
Since you are sure that this is not your account, send a cease and desist letter to stop all communications with you. They must not call you over the phone or in your job. If they have to communicate with you, it should be done only through mail. Once this letter is received by them, they must not call you further. If they do, you can file charges against them for violation of the cease and desist law. If your state laws allow not taking permission from the other party, you can record the phone calls secretly.