Barking up the wrong tree

NBA call centre have relentlessly been contacting me regarding alleged accounts, I have for months been asking for proof of accounts, original contracts, time lines ect. Finally today I received a spread sheet, detailing amounts from 2***. The spread sheet contains no creditor or debtor information, just a bunch of amounts which are unsubstantiated .As far as I am aware this would anyway fall under the Prescription Act as it dates back over 3 years. I believe as of March 2015 it is ******* to collect on prescribed debt. Unless you can prove otherwise please don't harass me any further.