HI Kai,
We have designed our theme this way. If you want to remove the link of contact us then it needs code customisation. Before making changes in the code first of all create a child theme and then only customize the code. So that while updating to new version all your customized code will not be lost.
The link is added in phone number because if the user/ clients want to contact then they can call directly from their cell phone.
Thank you!