I used to hit him where it hurt in the gold shops.... I have that gold and it's worth twice what even he paid for it... so will sell it when I get the chance.
LadyGrace, I understand your thinking, totally, it IS wrong on many levels to focus on making them pay in the short term, but somehow it IS getting something out of the trap we find ourselves in. As in, we are momentarily stuck, so there may as well be something I get out of this.
anjali. My dear, thanks so much for your kind words, they do help me a lot.
but now back to you.... 
Love, sadly this man is trained and educated into knowing that he has every single right known to mankind to treat you as he is. He will not change. No matter what words you use, what language you speak, nicely, or with a baseball bat or gun held to his head, you will not change his feelings of absolute right to dominate you in all manners, and to demand what he wants from you, when he wants it.
Worse is that his entire family will think as he does, perhaps even yours too, so you won't have support from his parents/siblings and very likely not from your own parents either.
This doesn't make what he is doing to you any less wrong, any less abusive. Nothing will make him rethink, not even your spending, he is more likely to lose his temper and clamp down or punish you in some other way. Remember how insidious these characters are.. it won't always be a huge in your face kind of punishment. The smaller stuff actually really hurts a whole lot more.
Can you sell the things you bought? can you use the guilt laden credit card to build up a chuck of cash? can you get a bag packed, can you look into getting a place to stay?