Had washer and dryer installed and having issues.

I had a washer and dryer installed today and it was done correctly. They ran a quick test to make sure the washer was working correctly. Now all of a sudden the toilet water in the bowl is low in all of the toilets and the drains for in the shower are draining really slow. I have limited plumbing knowledge and have no intention of tackling this myself but looking for insight on what might have happened. Also this is a new construction home and was built this year and just finished being built end of August.

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