How do I speak to a human employee and change my contact phone number.

Hello O2,

My contact phone number on the "meinO2” page is wrong. Since the technician that will come in a few weeks to install the infrastructure might need it, I wanted to change it, although there is no option for me to change this on the website. I tried calling the customer service, but I get an automated voice speaking German which just never stops. The chat function does not work at all, and when trying to get in touch with a real person via whatsapp, I usually get a response a day later which is then already closed again, since I did not respond within 2 hours after the O2 employee had responded. You must understand that I am not on my phone constantly, especially when at work. This message is my last hope on getting in touch with you guys. It has been three days now of struggling to speak to someone. It really should not be this hard to give you guys my correct phone number.

I hope this will be sorted out soon.

Best,

Linda