Unfortunately, I'm thinking they are dead and past saving. More watering is probably the worst thing you can do. Watering "day and night" is almost never a good thing to do. People think oh it's getting brown, it must need more water, but the browning may be already due to too much water.
Some how your topiary did not survive the shock of transition from where it was to its new location. I think even in pots it is very difficult to move large full grown trees like that. You wanted instant look of maturity, like the trees had been there for years, but that is very difficult to fake.
You would be much better off to start with small young trees, which are more adaptable and let them grow in place. But even so when you bring home a tree, you need to put it in a very shady spot and gradually expose it more and more. Look up the kind of tree you have and its needs as far as water, sun, etc. Each plant has its own set of requirements.
I hope where you bought the trees, which were undoubtedly quite expensive, gave you some kind of guarantee.
Sorry to be the bearer of bad tidings.
I think you didn't get a response sooner, because no one wanted to be the one to tell you your very expensive trees are goners ...