13 year old debt with expired CCJ

[Sox1000]

In 2016 I was given a CCJ for unpaid debt 5 months before statue barred. I didn’t acknowledge the CCJ. So I was hand delivered court summons by court Bailiffs with a means of earnings form. So I filled all out and sent it back. Within the month the decision came back that the Judge had thrown it out with nothing to pay. So Wright and Hassell the debt solicitors dealing with it. Sent me a letter saying that they are aware the debt has been deemed nothing to pay but asked me as a good will gesture to pay a small amount each month,,which of course I didn’t as Judge had ordered nothing to pay.
so i don’t hear no more. Until October 2023 debt has been sold to Mortimer Clarke Solicitors. I have explained all to them that in 2016 I was taken to court and Judge threw it out. But they are having none of it. Their latest letter states that the debt is payable by County Court Judgement given to me on 18th February 2016 and the judgement deems me liable for the debt. As judgement has been obtained their client is under no obligation to provide me with any further documentation in relation to this matter.
Now I’ve googled how long does a CCJ last if not paid. And to my understanding it stays on your credit file for 6 years then drops off even if not paid. But does it still stand if not paid.

[Sox1000]

Have just come across this on CCJ enforcement time limit.
Once the six-year time limit for CCJ enforcement has passed, the judgment becomes “statute-barred.” This means that legal enforcement action is no longer available to recover the debt. However, it’s important to note that unless paid, the judgment remains on the debtor’s credit record for the entire six-year period.