Well, the order was quite explicit in that if they didn't submit further amended PoC by 15th August, the claim is struck out.
Did they submit further PoC by that date? If they did, they were obliged to copy you in on them. They didn't, so the claim is struck out and that is the end of the matter.
If you want absolute peace of mind, give the court a quick call with the claim number and ask them to confirm the current status – they should confirm that it’s either been struck out or discontinued. In either case, there’s nothing more for you to do unless a brand new claim ever turns up, which is highly unlikely.