Hi chasejk
Check the date you last made the payment on this account. Perhaps, it might be out of the SOL period. You must know the laws in your state before considering the SOL factor.
RJM acquisitions must have the details of your account. Ask them to send it in writing so that you can review it thoroughly. If they have reported inaccurately in your file, the item must be removed from your file. If the debt is within the SOL period, work out payment arrangements and get it marked as "paid collections"
Don't pay anything till you have review the account in writing. The name of the creditor should be evident for whom they are collecting along with calculation of the principal amount and the interest charges. Besides, check whether the debt is within the SOL before making any commitment. Send your letter certified with return receipt requested. You will have proof of your actions.