Another problem with DFS, £950 usage fee for an item i never received

To keep this post short, all the details are in my previous dfs discussion but i paid the extra option of £399 for a full leather sofa including back and sides ( non touch areas )
I was delivered a half leather sofa mistakenly which has been confirmed now by multiple dfs so called engineer employees attending, the sofa also has a faulty bracket that clips the back seat onto the sofa, this has been repaired twice but still broken.
Dfs still refuse to accept its not all real leather and said their engineers dont know what they're talking about.
I went through the furniture ombudsman who are absolutely useless and just side with the shop no matter what evidence you have.
Both of them have ignored the issue with the leather and said due to the faulty bracket i can have a refund minus a £950 usage fee which could increase after assessment of sofa.
Ombudsman closed case and stopped replying saying this is a fair offer by dfs as ive had long use of the sofa and bracket is faulty.
I tried to explain as i have never received the sofai paid for and been trying to give it back since delivery due to leather i shouldn't be charged a usage fee, ive been forced to store the incorrect item.
If i go to small claims court will i be able to claim my court fees back which will be over £500 ?
I now have a report stating it is artificial leather, i have video evidence of their engineer stating its vinyl with a matched pattern.
So stressed by this, its been going on and on for months with the ombudsman not replying then they say they're waiting on dfs, then they kept claiming they couldn't see my evidence even though i could log in and see it on multiple devices, now they closed the case.
I did dome research and found the ombudsman is fundedby the businesses so wont go against them and this is a common occurrence.
Any advice from someone whos used small claims would be appreciated