I have nothing to treat my son with

Hi.. Have have been paying c s a.. From source at work since 2011… Every month.. With little increase in salary .. At a rate of £34 a week… A figure set by this lowlife interferes… And have my son who is now 4 on a regular basis one day in the week an nearly both days on the weekend…

In November of 2013.. The job I held was lost through no fault of my own.. I did however manage to find a job almost immediately .. On less hours an less money… I sent the required paperwork to csa to inform them what had happened ..and I was slapped with a so called arrears..

They now take £86 a week from me .. Which I have protested. But im guessing it will fall on deaf ears.. They started to take the money from source .. Without prior notice.. The only way I found out was jargoned paperwork which again never mentioned arrears and an emailed payslip..

The money I have never makes the week. What bit I did have was spent on my son on ordered contact which cost me many thousands on a low wage.. Now they have taken the extra… I have nothing to treat my son with … Does anyone know how to fight these people please?