Is it possible to increase iPhone's GB?

Okay, so this dumb man put the wrong iPhone 5 to the box and sent it us and I can't buy a new one… It's 16 gb but i want with 32, is it possible to change that?

Sent in a complaint to Apple. I'm sure they'll fix the error.
Otherwise, there's no Easy/conventional way of giving an iPhone more GB and keep its form factor, or you would need a donor iphone lol

Crack it open, change the chipset to that of an iPhone that supports 32 gigs, buy the necessary, compatible memory, solder it to the chipset, replace with current chipset. If that seems like it's too much, then I agree. There's no other way to add memory, a physical hardware, to an iPhone, you'd be much better off demanding the iPhone you paid for.