HELP! IPHONE ISSUES!!!

Zoe
My iPhone battery is lacking and won't charge correctly!!! I'm 17, and told my mom about it and she's ignoring me. My iPhone has been dropped and cracked. How much is a brand new iPhone 7? Or 6? Any advice what I can do?;( I don't have a job right now either, due to school and homework. any good advice? Please be nice! :/