my zte majesty screen goes black while on a call & wont let me use dialpad or hang up afterwards??

[AC Question]

my zte majesty screen goes black while on a call & wont let me use dialpad or hang up afterwards??

I have a zte majesty refurbished phone, every time i make or recieve calls..screen goes black, will NOT come back on when i need to use dialpad will NOT let ME hang up..i always either have to let other person hang up..or if a vm..i have to take battery out...please help!!