KLL
OMG, don't take this humiliation as your fate. Show your stronger side and strike with legal charges of using abusive/profane language. Get the calls recorded and show it to your lawyer. If recording of debt collection calls is permissible in your state, do it. Otherwise, inform the caller that you are recording it for legal actions.
Regarding your debt, the debt of last activity in this account is 12/2000. In which state did this account originate? I wonder it might be out of the SOL period. On such circumstances you can't be forced to pay it and can't be brought under any legal actions.
I am assuming that Asset Acceptance is doing some kind of fraudulent activity in your credit report. Two companies cannot report for the same account at the same time. Dispute with the credit bureau that is reporting this account. They will investigate the matter and correct the file. They will send you an update copy of your CR.
When you get a call from Asset Acceptance, keep in mind of recording their call and ask for debt validation. The collection agency is bound to send the details of the debt in writing after you have placed the request. Send your letter certified with return receipt requested. Doing this, you will have proof to defend yourself and file legal charges against them. Have proof of everything while you are filing charges against the company. Asset is one of the worst debt collection agencies in the market. The perfect term that comes in my mind for them is that they are 'goons and scumbags' Be careful.
I think you can look for some professional help also. The debt consultants are trained enough to handle such kinds of collection agencies and you will be free from all their harassments.