When Completing a Call its needs 2 coins.

I think this needs to be changed from Coins to like 100 credits and not more then that because when i have like 20 different calls raging from Office building fires to warehouse fire, I just think when people have no coins and they cant finish a call, It would be better to have 100 credits to just finish up that call and keep sending units to those calls that dont need a whole lot of responses from department.