iPad mini 4 says it’s charging when it is fully dead but it doesn’t charge

If you let your iPad charge for at least 45-60 minutes, and if you already tried (to no avail) all the steps provided in this support article:--> Fix issues with charging , it could be a hardware (battery? charging port? other internal component?) failure but we, just users like you, cannot diagnose that issue remotely.

I suggest that you make an appointment (*) and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> https://locate.apple.com/choose-country-region . After checking it out, they'll give you all the available options.

Regards

Giulio

(*) You can do it:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple;
• Contacting a local Apple Store or AASP among the list provided above;
• Using the "Apple Store" app, available and downloadable from AppStore.

You're most welcome