I switched to KPN for internet but the service will be at least 10 days late

Hello,

I have switched to KPN on 1st of February and they inform us that the service will be available on 28.2. 

We received the router box and installed it properly (all leds are green except the internet led on the router is flashing), even after receiving a SMS that says the internet service is active now.

We called customer service and the only thing that they suggested is sending an engineer to check this problem on 11th of March.

So, how can we work now without internet specially that we are providing an online service and working from home ??