If the uth is not on a tstat it needs to be and you should unplug it until you get one.
What are you getting your temps with(what kind of thermometer)?
What bulb are you using in the lamp? You may just need a higher watt.
Is this a glass tank? If so you can make a cardboard cutout that fits the screen top. Cover it with foil and make sure to leave a window for the heat lamp. This will help keep some heat in.
Also if it is a glass tank you can cover the back and sides(on the outside) with something to insulate it and trap heat. I use thick art paper and it bumped my temps about 3 degrees.
A pic of the setup would make it easier for me to give more specific advice.
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