Q: iphone 6 battery exploded

Was it Happned When it was at your hand or When it is Plugged in To Power?

Take it in to Apple and let them see it. This is not Apple support here, these are merely user forums.

Then you need to use the support link on the Apple Africa support page - iPhone - Official Apple Support

and direct your query to Apple. For the most part, Apple does not participate in these user forums, so they may well never see your post. Use the support links to get the contact information you need to get in touch with Apple Support Africa (Apple support treats all of Africa as one region, so that one support page serves all nations in Africa).

Almost always caused by using non Apple certified charging cables and chargers.