CSA get a County Court judgment against me

I have about £25k arrears to pay back to the CSA as they have a wages attachment order following a County Court judgment against me. I have asked them for permisstion to have the judgment set aside and they say I can’t as the 28 day appeal period elapsed.

I am currently waiting on a response from the Data Protection Unit for the printout subjection to DPA 1984/88 in relation to obtaining all notepad and clerical computer entries. I did not know of these proceedings and can prove I was not residing at the addresses they were writing to at the time.