If under warranty, use the following instructions to get them replaced/fixed through Apple. Click link to see if you quality for a replacement: https://checkcoverage.apple.com.
1. Enter the Serial Number for the device with the broken charger and follow the instructions on the page
2. Click: Set up a repair
3. Click: Battery & Charging
4. Click: Power Adaptor is not working as expected
5. Choose the “Send in for Repair” option.
6. Using the “Talk to Apple Support Now” option if you have questions.
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