Problem in E2Save Cashback

[tomaltoct09]

Hi everyone,

I just got a letter saying they've rejected my latest claim
(sent mid Aug - it's for £70 and I've another claim for £70 in Mar -
which I guess wont be processed unless this one is sorted).

They say I sent the wrong bill and it's been checked by their
'panel'.I'm sure I sent the correct bill but not sure how I can prove this.

Any ideas what I should do next?

1) write a letter to them saying they're wrong or

2) go straight for small-claims or

3) something else?

E2save Cashback (http://www.topcashback.co.uk/retailerdetaile2save.htm)