Connected without internet

Hello,

I subscribed an internet contract for DSL o2 Home 100. A technician came today and installed my router and mentioned to me to wait 10 minutes before connecting internet.

I also received an email from o2 with the confirmation that my line had been activated. 

However, when i connect to wifi I have no internet. It says “connected without internet”.

Is there any additional step I should do? How can I get some help?

I tried to call the support number, but I don’ t speak german.

Thanks!