I’m paying CSA but I’ve been threatened by bailiffs

I have been taken to court for arrears. At the time i could afford the £100 per week but due to loosing my job and the economic melt down, I contact the CSA by mail to let them know that i could only afford £100 per month. I heard nothing from them so i changed my standing order to £100 per month. I admit i have missed a couple of these payments but generally i have kept the up. Out of the blue i receive an enforcement letter from a company called Marston. I contact them via email but had no reply. I told them i was in contact with the CSA and the dept was being paid from my bank. I have now just received a final notice with intent to recover goods from my home. What can i do? “HELP” please.