Extraordinary contract cancellation due to moving abroad - Postal tracking request

Hello O₂ Team,I am permanently moving out of Germany and have submitted my extraordinary cancellation (Außerordentliche Kündigung) via postal mail to your central hub.Inside the envelope, I enclosed my official German deregistration certificate (Abmeldebescheinigung).Since I am preparing my relocation, I need to ensure that the document has been successfully received, scanned, and processed by your backend team. Could an official moderator please check my account status and trigger the official cancellation confirmation (Kündigungsbestätigung) to my registered email address?Thank you for your help.