I tried adding a euro to my account but that had no effect. Surely the 25c issue is gone now anyway with the new EU roaming.
I will go back to Apple again. Had a good chat with their customer support yesterday and the best solution they could offer was to try an arrange a call between themselves, EE and the phone's previous owner, in the hope of EE discovering that they were wrong and actually can unlock it after all. I'll try this but it make take a while to arrange.
Did you ever get this sorted ?
Did you try the suggestions that I posted above?
Are you actually using an iPhone because your post is ostensibly coming from a Huawei phone?
Hope this helps.