I had visited spain for 3 days in October and I thought since my monthly plan covers EU region, I happened to use my mobile Internet.
Next month I received an 100 euros extra bill for those charges which was very surprising as spain is a part of EU and I did not get any notification regarding the extra charges. Additionally, since it is a prepaid monthly plan, either the company should have not provided services or informed me about it.
Kindly let me know how can I deal with this situation as 100 euros is quite a big amount.
Edit by o2_Katja: Moved to our english community