Webafricas ***** 30 day sell

Webafrica sells you the notion of a 30 day service when in actual fact they give you 29 days. The account was paid on 26/06/2024, meaning I should have service till 25/07/2024. I currently have no service and it was cut before 3am this morning. Meaning I've enjoyed 29 days of WiFi not 30. The agent says if they give me service today and cut off tomorrow I will have received 31 days of service🤔. What drivel is that? My 30 days should end at 23:59 on 25th. Please correct me if I'm wrong, I'm not that learned.