Do you have any options? Did you submit an AoS?
The very first thing I suggest you do is check your MCOL history and see if you've already been issued a CCJ by default. You most likely have by now but, just in case you haven't, do two things in this order:
1. Submit the defence I provided (just the body, not the headers or Statement of Truth) using the MCOL webform.
2. Go buy a lottery ticket.
However, I suspect you already have a CCJ, in which case, if it was issued less than 30 days ago, you pay it in full. If you don't or more than 30 days have passed since the CCJ was issued, you are going to be in a world of financial pain for the next 6 years.