Refund

I had a train cancelled a few weeks back. Due to some ill health and personal issues, I didn't contact Northen to request a refund of the cancelled train ticket until after 28 days had passed.

Northen have replied saying that they cannot refund due to not contacting them within 28 days.

There's no question that the train was cancelled.

Is there any chance of getting a refund after 28 days?