AArrgghh, i so hate men like this. It sounds exactly like my ex, for 1st year i had LO we had preivate arrangement like this, and like this, he usually never got paid on time, correct amount, and even put LO off til he paid for nights out, weekends away, etc. He then said he didn't trust that i was spending money on LO (he thinks that money i earn is enough to take care of LO and i was using his money for enjoying myself, lol) so opened a bank account where he says he put the money every month (i have never seen proof of this, and doubt that it exists). Only this year, my LO is now 3 i finally went to CSA and am having money deducted from his wages, however, he is now cutting hours, etc.
I would say stick to your guns about this now hun, the longer you let him get away with it the further he'll push it. I think that if he doesn't give you the money Tuesday i would stop contact this weekend, now u've made the threat you have to follow it through, hopefully the shame of telling his family why he's missing contact will give him a shock, and make him realise that your serious.