Cable activation confirmed but no internet for 2 days

Hi community,

My official O2 Cable activation date was the 19th of May, switching from Vodafone. I have now been without internet for over 48 hours. O2 sent me both an SMS and email confirming successful activation at the end of the activation date, yet I still have no Internet connection.

My router is a FritzBox 6660 Cable using my own hardware, not an O2 rental. When logging in to my router the cable signals shows green (ok) and the router successfully reaches the O2 network (router to ISP link shows green in FritzBox GUI), but gets stuck at the ISP authentication step and never reaches the internet. I have performed a factory reset and firmware update with no improvement.

I have called customer service multiple times and was told to wait each time and that everything was looking good on their side. On my last call I was told the earliest a technician can visit is in 2 weeks, which is simply not acceptable.

What are my options here? At this point I am seriously considering whether cancelling the contract and going back to Vodafone might be the easiest solution.

I would appreciate any help, thanks.