where do I go for servicing my mac book (2015) i also need to change the battery

These links show a few more options in addition & also 'genius' in-store..

• Check Your Service and Support Coverage - Apple Support

https://checkcoverage.apple.com/

• Apple Repair and Repair Status Check - Official Apple Support

https://support.apple.com/repair

Look into site for other important details.

[ Start a Repair Request ]

https://getsupport.apple.com/

• Genius Bar Reservation and Apple Support Options - Apple

https://www.apple.com/retail/geniusbar/

(sometimes limited to 'hardware help' where you'd leave product)

You could make an appointment at the Genius Bar of your local Apple Store or find an AASP ( Apple Authorized Service Provider) , make an appointment with ‘en and take it in..

john b