Which letter now for claiming back charges?

A question about : Which letter now for claiming back charges?

I sent the preliminary approach letter 14 days ago asking for my money back of Ј700.
The bank have now replied advising as a goodwill guesture they will give me Ј300.00

So which letter do i use now?

The letter before action? this says failure to respond etc but they have done
or
Refusal letter (this says as per my previous letter you have until X date) but this has now past (well is today)

Help its all a bit confusing.

Best answers:

• Send the LBA if fourteen days have elapsed, just edit the wording from 'failed to respond' to 'failed to respond positively.'
  It's up to you if you decide to accept the monies offered as a partial settlement only, with the clear understanding that you will be pursuing the rest through the courts. There's an excellently-worded letter to this effect in the templates section of the Consumer Action Group website.
  All the best with your claim,
  Lucy.
• Yep... LBA next
  CG