I apologise for being sarcastic towards you before, but you really do not make it easy for people to help you.
Please, finally try to understand what is happening legally.
Initially there were two legal "fights" going on, the builder against you for around £2800 and your counterclaim towards the builder for around £16,500.
You won on both because the builder didn't comply with court directions.
Then at the set aside hearing the builder managed to reinstate the £16,500 counterclaim "fight" (see attached).
The builder's original around £2800 claim, is dead, buried, gone for ever. There is no mention of it in the attachment.
If you are referring to -
8. Because extras were added the total of due was £6,880 of which I have only received
£4,366.60. I carried out all work save for the piling which I could not undertake.
then that is simply the builder describing the events from their point of view.
There is no claim for you for around £2800. You won that part of the dispute.
CAg Order TenJan.pdf