who is the person responsible for my money apart from my broker

If Iam Investing a money in sharemarket
and i want to withdraw my money from market after all the clearnce of my positions
if i cant get my payout back at the time
who should i need to contact directly apart from the broking house that i trade
who is the person responsible for my money apart from my broker
how can i contact them and complaint about the company by voice????????? any questions