Die Aufbuchung konnte nicht durchgeführt werden. Ihr o2 Team

I am facing this problem since a week and my internet speed has gone down from 100 mbits to 0.1 Mbits. I even called the customer care but still not received a solution. I write "WEITER" in the msg box, but The message box says on replying Die Aufbuchung konnte nicht durchgeführt werden. Ihr o2 . Please provide me a solution as early as possible 

Edit o2_Gerrit 12.06.2026 moved to English O₂ Community: Mobile