Problem with Barclaycard/ Stonebridge insurance

[mezzanine]

I have found that Barclaycard/ Stonebridge had been charging me for an accidental death insurance I did not want or apply for some years ago as being self employed and working at heights I had to carry my own special accidental death insurance. I have contacted both companies in March 2017, they passed me back and forth until late last year with no result other than an offer of £25 from Barclays and £50 from Stonebridge which I did not accept. In Stonebridges case they wanted me to sign a form saying that the payment in full and final settlement which I found strange. I went on to make a claim through the Financial Ombudsman, but they were about as useful as a chocolate fireguard. They have just come back to me to say they cannot help. My question is should I now make a claim on the small claims court. Any advice would be welcome. I have full documentation and a sequence of events if that helps. Many thanks for any help.