Internet contract without dutch phone number

Good morning,

next month I am going to move to Maastricht with my family. We have already signed the rental contract for our new apartment and therefor we need a new internet provider. I tried to order the internet contract online but it seems that you need a dutch phone number from me. Since we are still living in Germany we dont have one. I would apreciate if you have a way to solve this problem. We would need the Internet connection by August 16th.

I am lookng forward to a response!

Thank you