By now you have hopefully fully realized that the child support office is not your advocate. They do not represent your best interests. And you should never assume that they do. That was your first mistake. That person is not "your" case worker, they are representing the interests of the State, which are more closely aligned with the interests of the mother of your son.
If your circumstances have changed (i.e., you lose your job and your income is reduced), it is incumbent upon you to "notify" the Court of this fact. That notification does not mean you call up the local child support office to tell them. Or that you physically walk into their office. That is not a proper "filing." Might that result in a reduction in your child support? Possibly, I suppose. Or possibly not. Why would you leave that to chance? You should have filed with the Clerk of the Court a Petition or Motion to reduce your child support based on your lower income, and served a copy of the motion on your son's mother. I assume the law in your jurisdiction is that your child support cannot be reduced retroactively, meaning that only the support obligations AFTER you filed your Petition to modify can ultimately be modified. You may be out of luck trying to convince a judge that your pre-filing ordered payments should be reduced. The judge probably does not have the jurisdiction to reduce those.
You speak of an "adjustment." What was adjusted? Did the Court ORDER that your current child support is reduced down from $430/week (which, by the way, is a very high amount, IMO), to some lower monthly amount? Did you actually see a copy of the signed order? The order will usually contain two orders for payments: one is the amount of your current support obligation, and the second is the additional amount you are ordered to pay toward your arrearage. The arrearage will continue to grow by the amount of your current monthly support obligation that you do not pay. That arrearage will also accumulate interest on the unpaid amount.