Statute barred followed by warrant of control

I received a letter regarding an outstanding debt from years ago ( over 6 years )

I sent the debt collection company a statute barred letter stating that I neither acknowledge the debt and have had no correspondence nor paid anything for well over the 6years for a debt to become statute barred and they still obtained a county court judgment and have now issued a notice of issue of warrant of control , they did not comply with evidence I requested that this debt is not legally barred '



what can I do

Statute barred followed by warrant of control