They can also fairly easily issue the legal action so while saying don't panic is correct, do nothing is not advised.
Can and do are two entirely different things.
They rely on pumping out letters from the Threat-o-Matic and scaring a good enough percentage into paying up, rather than actually taking people to court, as a rule. I've handled cases for people who've had all the hundreds of letters threatening legal action, then the "7 day" letter, then the solicitor's "final plea", only to call up the DCA on their behalf (having submitted a written authority) and said simply "Mr X does not acknowledge this debt, and I refer you to the letter dated XX. Cease and desist from harassing him, else I will commence immediate action against you under The Administration of Justice Act, The Protection from Harassment Act and others. If you feel you have a case (and I assure you, you haven't) then please file an N1 at County Court - my client awaits his summons and will defend his case completely and thoroughly. Else, go away and don't bother him again." Strangely, I've never had a single person come back with a summons to date... 
Oh if only they operated with such ethics. My general (rather extensive) experience of DCAs is that they'll chase anything and everything. Even if it's not the right person, or the right address etc. It's a very rare thing to find a DCA with not only a legitimate debt but also a deed of assignment from the original creditor (a legal requirement to pursue an alleged debt). They're sharks, threat merchants and bullies, on the whole.Everything else is fairly true, chances are if they are chasing now it means they have got a good reason to believe this money is still owed.
That doesn't mean the OP should ignore this, he should simply write to them stating that no such debt exists or is acknowledged. Leave them to it. Once they start pumping out more threats, and change the letter heading (the guy on the next desk will have a "pre litigation" headed paper or similar), you can send the "go away or I'll sue for harassment" letter and they'll leave you alone.
Been there, done that, got a ton of t-shirts. OP don't ignore it, but certainly don't start producing paperwork and protesting. That tends to just generate more letters and gear them up further. Just send them a nice simple foxtrot oscar.
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E.g. you could have paid by cheque but the cheque bounced but they never reconciled sort of thing.