I don't know of anything that tells me not to except a turn just because I've had an TA! If this TA becomes an RA then I will do what the magic box tells me to do.
So if the magic box shows just an TA then I will definately do what ATC tells me to do. Our manual even states that if an RA is given in a turn then the turn me be continued!
In other words, I would completely disagree with someone not following an ATC instruction on the bases of an TA! (not RA).