Reclaiming Bank Charges

Got a call from Bank of Scotland Customer services today.
The Girl very nicely offered me a tidy sum of £156 as a refund for my charges.
Explaining what I had read and that I would not accept that offer, she then offered me the tidier sum of £586.
All the things I have read on this says I am entitled to the full amount.
I have told her that I will now be taking this to the small claaims court to claim the full amount.