Case C-388/13: Judgment of the Court (First Chamber) of 16 April 2015 (request for a preliminary ruling from the Kúria — Hungary) — Proceedings brought by Nemzeti Fogyasztóvédelmi Hatóság (Reference for a preliminary ruling — Directive 2005/29/EC — Unfair commercial practices — Erroneous information provided by a telecommunications undertaking to one of its subscribers which resulted in additional costs for the latter — Classification as a ‘misleading commercial practice’)