Never ever talk to a CA!!!!!! (on the phone). Why? They often record what you are say and it is easy to get flustered. Also, a CA's word is not their bond. Also, calling them automatically gives them your phone number.
I'm certain with 14 years gone, you are way past SOL. Legally, if they try to sue, you would have to answer the summons and maybe even go to court, but they cannot win. (Think very likely won't ever happen.)
And with 14 years gone, it is 7 years beyond CRTP. It won't ever appear on your CR.
However, CAs, even past SOL and CRTP, can continue to try to collect forever. I would DV them anyway CMRRR ASAP. With a DV letter, they cannot engage in collection activity. They won't call or send you annoying letters. But they can sell your info to another and another and so on.
Just be 100% certain that this $28 paid debt is 14 yrs old. It seems strange that they would waste time collecting this. They will certainly spend $28 in labor and postage going after it.
ALSO, BTW, double check your SOL. It seems like I saw one state that had a separate provision regarding the SOL on medical. You'd have to snoop around.