My phone battery just won’t work I tried turning it on, it shows that my battery is dead i plug it in says that is charging but won’t cut on. What do I do btw it’s a iPhone 6+ and I just hot this phone not even 1 month ago

Read this support guide and give a try to all the steps provided:

If your iPhone, iPad, or iPod touch won't charge - Apple Support

In nothing changes, have your iP6+ checked at your most convenient Apple Store or Authorized Service Provider:

Apple - Find Locations - Location Selector

keeping in mind that Apple Stores offer battery replacement at a reduced price of $29 untill the end of 2018 (I would make an appointment before you go there).

Regards

Giulio

If the battery is completely dead, you have to keep it sitting on the charger for a little bit before it will even turn on FYI