iPhone 13 Pro Max gives an electric shock when charging

No comment.

You should reach out to Apple Support directly just in case what you claim is true. You should be able to reach them here

Contact - Official Apple Support

or phone numbers

https://support.apple.com/en-us/HT201232

This seems like a very serious issue, please contact Apple Support for further assistance

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We want to make sure you reach the right team for help with your device. We recommend that you contact Apple Support directly. Depending on your region, you may be able to contact them here: Get Support

It might be.