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@samskipp topping up doesn`t get you payback
Topping up doesn't give you payback, to be given payback you'd need to help out other members on the community forum or by sim referrals, if you haven't done any of these things then i'm afraid you won't get any payback.
have a look at your payback in My giffgaff and it will tell you how much you should get if any,