HANDING OVER OF AN OLD ACCOUNT

My husband had an account with rcs in 2007, i cannot say what his payment history was before i met him, but i met him in 2008 and eversince we've been together he has never once made a payment towards the rcs account, nor did he get any correspondence from rcs for any monies outstanding, etc. he had the same contact details for over 5 years, and only recently changed his details,so, from rcs's side, they cannot say they couldnt get hold of him. No correspondence for almost 8 years, and now all of a sudden, this past friday, 29 MAY 2015, we get a call from a lady, (AFTER HOURS, WHICH IS AGAINST THE CONSUMER PROTECTION ACT) Saying she is from rcs lawyers, and he has been handed over for the outstanding RCS account. I told her that this debt has prescribed, which im sure RCS is also aware of, and that we are not going to pay any debt older than 3 years. I asked her to email me the \ proof"that we owe this money so i can take it to my lawyers"