WHY CANT I GET SUPER SAIYAN 4 GOKU?!?!?

Ive opened at least 6 Super Saiyan 4 Goku multi summons plus 1 free multi summon and only got like 4 SSR characters. I havent even gotten Goku yet and its just so stupid! I NEED HIM BUT I CANT BECAUSE THIS GAMES SSR DROP PERCENT IS HORRIBLE. Please change, PLEASE!!!!!! JUST GIVE ME 500 DRAGON STONES FOR FREE! My username is EnderSoul in Dokkan Battle! PLEASE I NEED SUER SAYIAN 4!

xEnder_Soulx about DRAGON BALL Z DOKKAN BATTLE, v3.1.2