Not impressed

I have logged the same dispute with Transunion 3 times already and i am receiving feedback saying they have creditable evidence with no proof.This Nimble account i disputed is secondary debt that arouse from a prescribed debt and they can not provide proof of their claim. I find this highly prejudice as the is no proof to support their claim, all thee other bureaus VCCB, Experian and XDS have removed this information but Transunion keeps sending me an automated response. Please provide original proof of acknowledgement from the creditor or remove this account immediately.