Hejsan , @Muhammad Siddiq 

The cost you mention corresponds to the additional user family subscription.

This link contains information on how to sign the invoice. It may be that you pay for a paper invoice and have a fee for it. In that case, it is possible to apply for Autogiro or E-Invoice.

If you don't want extra users, you can easily remove them by logging into the Mitt3 App or in a browser. Or when contacting customer service.
 

Here you have information on how to apply for Autogiro or E-Invoice if there is a need for it. Unfortunately, the page is only in Swedish.

Regarding invoice questions, you need to contact 3 Customer Service. So they can easily go through your invoice and help you make changes if you want.

Here you have contact details for 3 Customer Service.

https://www.tre.se/support#kontaktaoss

/ F