how do i get my arrears chhild support garnishment terminated from my social security retirement benefits as it is impossible to live on $256.20 left

I receive $732,00 social security before garnishments from orange county florida and Suffolk county new York. I receive only $256.20 each month, the children are 8 to 25 years beyond emancipated age and both x spouses are well off. I cannot exist on these meager benefits any longer as I am now 71 years old and my health is deteriorating. in new York I never went to court and knew I had a child support order nor did I know I had a sibling resulting from this marriage. only after I applied for retirement did this garnishment appear. in addition the arrears were $5000.00 then went to $9000.00. I've been paying so long that it{new York} should be paid off by now but I cannot get any information from child support enforcement there by phone. I cannot afford an to enlist the services of an attorney to help me. if it is possible I would gladly remit a portion of my benefits each month to pay for services rendered as I am paying out the nose now. what are my options now? please help.