I would speak to the court and ask for judgment.
They can not just set the judgment aside, they need to show good reason and you can request this to be in a hearing. If it came to it, you could show in the hearing that they have never defended any such claim and they are simply abusing the court system to their own ends.
I have had this same issue with Crap1 I asked the judge to decide as they entered a "late" acknowledgment and notice of intent to defend. Judgment was issued and they have paid up.


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Halicrap - Full settlement 12/06 £408.34
Crapitol 1 - Settled in Full 27/04/07 £1580
All & Pester - LBA sent for £3017
Woolsnitch mortgage accounts - Prelim £1687.50, LBA sent
Lloybles - Data Protection Act non disclosure, Information Commissioners Office ruling to comply