We are also trying to get our Veiled used to us too for the last 45 days. We think he wants us to die and go away hopefully with the cage door open.
He may well sweeten up.
Try and offer him some free ranging.... when I was at my wits end a few months ago, the wonderful JannB told me to try free ranging - on his terms of course - and it has made a real difference.
if you can't do this, then my advice is to just persevere.... Male Veileds can be really really cage aggressive and may never get beyond a certain point as regards their acceptance of humans and handling.
If you have a Veiled that doesn't respond to things such as hand feeding, opening the cage door and leaving them to their own devices (you must make sure, if doing this, that you have a safe habitat for him to come out and roam, i.e. no open windows or cats for example) and he gets no better within a period of about 6 months, then you must come to the conclusion that the chameleon that you have just does not like being handled and accept him for what he is. Some are friendly, some not - a bit like people, really.
I absolutely love my Ziggy to bits and it took me a while to accept the fact that he will always see me as a bit of a threat and never really want to come out, unless very rarely, on his terms. But now I have - and I love him just as much as I do my male Panther, who is much more friendly.
I get a lot of pleasure just watching Ziggy - happy and healthy, roaming around his reptibreeze cage, knowing that I am doing an A1 job of looking after him and that he is thriving in every sense of the word.
Some chameleons are like Marine Fish - beautiful and interesting - but watched and enjoyed from afar.