Child support /update

So my sons father hasn’t paid his child support and I was nervous about reaching out because he gets aggressive over VERY thing .

I reached out and said nicely I haven’t decided child support , maybe the mail lost it ?

He responded and told me that it say a person received it at my home . Well I never received it and I have NEVER have them deliver it to my door I live in a apartment. It always goes in the mailbox

So I responded can I have the tracking information so I can contact the post office.

And he told me no

So I’m not sure what to do

Also that is extremely suspicious because if I was in his shoes I would’ve just sent the tracking info

Btw he gives me almost 600 and I use it for my rent he actually faked tax papers then later said he don’t file taxes be would have to pay me more if I’d take him to court but I can’t deal with court it makes me ill I just wanna move forward. He likes to make everything difficult though

Edit : I have the DDS here, but he’s self employed and won’t pay threw them