Charger

This is a user helping users with tech questions, we are not apple and apple do not read your posts here

you can read about their warranty here Legal - Hardware Warranties - Apple

If you wish to reach out to apple then try  Get Support (apple.com),  Contact - Official Apple Support

The power adapter, that came with your MacBook Air, is covered under the same Apple Hardware warranty (or AppleCare+ plan, if you elected to purchase it). The warranty is good for one year past the purchase date and covers any manufacturing defects, which this may be one.

Regardless, an Apple technician will need to examine the adapter, and if it indeed is defective, you may find you can get a replacement at little or no cost to you.

... so, your next step is to pay a visit to your local Apple Store or to an Apple Authorized Service Provider. Alternately, you can contact Apple Support directly for assistance with this matter. To do so, simply select the "Support" link on the lower left-hand side of this forum's web page.