Hey - I tired doing a search but nothing came up. With the new *one* fares, does anyone know what happens to the extra segment costs?

I bought a DONE4 xIST and want to add an extra 2 segments on my NA Routes (already at 6). I called BA RTW desk for a quote and they said $400 per segment, but I told them since I bought it x IST shouldn't it be quoted in EUR. They stated that all extra segments are $400 + tax and then converted into the currency of the country of origin.

Can someone verify this??

thnx