If the walls are just damp there are sealers that come in gallon and 5 gallon containers and you apply like paint. Possibly add a dehumidifier.
If you have water coming in then you should be seeking the source of the water. Downspouts, proper drainage, etc.
Sadly, many homes are constructed with poor perimeter drains and poor drainage.
If you live on any kind of hill you can try to get all ground water to go someplace else besides your basement.
Any earth works contractor that does dig foundations can take a look. This could have the potential to be costly to do it correctly. You want the water to travel away from home. More and better drainage pipes can be dug/installed surrounding home.
This has been a tough Summer/Fall for ground water.
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