Sorry uploaded one to many pictures. The first on is a carrisa holly at another jobsite doing the same thing. And since i underbid by mistake i didn't focus on root wrap as much as i should as you can tell.
The 1st pic is a dwarf gardenia. In a poor drainage situation and especially clay soil, plant the plant high. If you must amend the soil you should do the whole area not just the hole. The amended soil accepts water more easily and obviously it isn't draining out. I doubt the drainage hole you dug will be much benefit.