I need some help with my next RTW in October. Everything is ready but I am having some problems with the ticketing.
It's a 20-flight-segment DONE4 ex BCN.

The first segments are BCN-LHR-JNB .......... leaving the three remainding European segments (open) as well as the two stopovers for the end.

I return ......... EZE-MAD (INTERCONTINENTAL ARRIVAL), use Madrid as one of my two allowed stopovers and Surface (on a separate ticket) at a later stage to London and fly LHR-DXB//-LHR-BCN (INTERNATIONAL ARRIVAL).

Would the arrival from EZE also count as an international arrival not allowing me to do LHR-BCN since I am entering the country of origin twice?

The best next option would be EZE-LHR, but no availability so far.

Qantas Spain has said no to the itn. Going to try Ba, not sure of the outcome with them. The Validator came back with an OK.

If BA says no, do you think I have grounds to argue with them?
Any advice much appreciated.