It's absolutely normal to creak...when you get a substandard installation.
One person already gave you a link to the manufacturer's site. One of the
most important prep steps is to
"Make sure the subfloor is flat. Any unevenness greater than 2mm (1/16'')
over the length of 1 meter (40'') must be smoothed
out. It is vital that you use an underlayment or leveling compound to
smooth any unevenness in the base floor. " according to the manufacturer.
It's the vital step on any laminate flooring.
Sue the so called contractor you got a hack job from.
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