well demonkiller owns me 500x booster..

i dunno how to proof it but i gave him some items like

Gold Force
Dragon Relax / Force + all trails
Vampire 2 trails
+ 50k

for 250x booster but he was late and he said till christmas he will buy me a 500 one so im waiting like 4 weeks.

i must pay to my clan leader 300k and i have 1 week left .. and he will ban me if i don't give him back.

Btw please help me what should I do about Demonkiller?

if u want me to proof then i'll try to find his thread about Boosters.
Ty