How do you write a noc letter for giver the permission for internet connection?

Here is one suggestion:

Good day! I am writing to you regarding the internet connection plan that I have subscribed to just the other day. I am giving you the authority to transfer the service and to work on my home to install the plan.

I understand that it will take you at least seven days to fully install my internet connection. I am hoping that my I could start using the plan by then.

I have enclosed here my first down payment amounting to ..., which will serve as the fee for installation.

Please call if there are any changes or questions you may have at my contact number ...

Sincerely Yours,

Your name.