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All concrete cracks, but if it was laid on a poor quality base then the cracks will be especially bad and the slabs can begin to shift creating high points. I'd advice you find a good contractor who works on small jobs, this job is to small for most companies who deal strictly with laying concrete. They'll need to jack hammer out the concrete, lay a new base, form it, lay rebar or concrete mesh, then have bring in a concrete truck or a mixer. Hauling away the concrete and bringing the concrete truck in are significant expenses by themselves. If the drainage around your home is poor then that should be addressed first, because otherwise it'll just crack again regardless of the base.
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