Have any Independent conservatives or Republicans been contacted by any political poll, to your knowledge regarding Presidential candidates?

I don't even know of any registered Republicans that have been contacted by a poll. Do know a few Dems. That's a really low personal sample rate though.

And they probably won't be,

I haven't been, at least not regarding any presidential candidate. I was contacted many years ago by Myron Orfield, when he was running for re-election to the Minnesota House of Representatives. I was surprised that he himself was calling me, but when he asked me if he could count on my vote, I had to tell him no. He got quite upset and told me that he thought he had done a good job, but that didn't change my mind. But I don't think I will ever get a phone call regarding any presidential candidate. I think they know better than to call me. :D

I don't know. If I don't recognize the number I won't answer.

Yes just last Wednesday