Like I said, check your fluid level and bleed it further..
If the problem persists, they likely killed your reman pump by pushing air through it on a test drive when it wasnt properly bled.
And if they didn't get all the air out before they gave it back, I'm sure it's on its way out from running air through it all this time... especially if you can hear it whining.
I, along with others on this site I'm sure, am running the same reman Cardone pump that you are.. and mines pretty dang quiet after getting all the air out.. just took me a week of bleeding it each morning..
And yes, I thoroughly went through the process each time. The power assist was on point, but it still kept whining..
She's as quiet as any of the other belt driven accessories now though lol..
Seeing as yours is an 03 as well, there's a possibility it had power steering fluid as the fluid before, and if they didn't flush it out completely before filling with ATF+4 (which they should have done), then you could be running a mixture of the 2 fluids.. and your pump won't be a big fan of this..