Roaming charges close to border

[DdraigGoch]

I've just had my mobile bill for last month. While driving alongside the external border of an EU country (my provider continues to offer free EU roaming), I briefly picked up a mobile signal from the non-EU country on the other side of the river. For the 1.25MB of data which was used in that brief moment, I have been charged the princely sum of more than £15. Bearing in mind that I didn't actually enter the non-EU country, what are my chances of challenging this? Has anyone been in the same situation? I can afford to write off £15, but the principle of it is grating.

Forgot to disable voting. Oh well.

Yes I challenged something similar to this as I kept connecting to the Irish phone masts even though I was in Strabane and the provider tried to say I hadn't been in the UK for 3 months so they were going to put me on some standard tariff.
So what I did was emailed them explaining the situation and they said if you connect to a mast once in a day that counts as a day spent in the UK. You can also disable roaming in your phone settings to make sure you don't accidentally connect to an Eir mast. You can also manually go into your "network selection" in your mobile data menu (on iphone. No idea on Android sorry) and let it scan for all available networks and manually choose one. If you do this you will be on that network until you go in and change it again.
I did also get my £10 refunded as I threatened to go public with the fact they were disadvantaging people on the border.
That was GiffGaff.

(obviously change the name of country and network provider depending on where you are, I'm imagining the other place this might be an issue is the Channel Islands).

Annoyingly, the Channel Islands are excluded from my Vodafone "EU roaming included in your UK allowance"

@PeekabooAtTheZoo thanks, it wasn't within the British Isles, I was in an EU country driving close to the border to a country which has never been in the EU but I'll try emailing them as you did. My (British) operator still offers free EU roaming, hence I hadn't turned roaming off because I couldn't (or at least didn't know if I could) finetune the settings to allow roaming when it's free, and disallow roaming when it costs. Selecting networks manually may work but I don't speak the languages of either country, and don't know which network operator applies to which country.

What countries are involved here and what network are you on? Most of the phone companies have policies about this, but some are geographically specific.

@DdraigGoch ah that's an awkward one. Can you Google which networks/abbreviations are for which country? I suppose you'd need your data for that at the same time as being able to see a list of options available to you, though. It's quite annoying that they just automatically connect to the nearest mast when you're on a country border regardless of charges so I hope they sort something out.

Well fair play to Virgin Mobile, one phone call and the charge has been waived.

For those asking, I was in Croatia, near the Bosnian border.

Good news! I have had similar issues in Greece when I went on a boat and sailed too near to Albania... got the charges waived but it took a fight!