It used to be a good policy for camera stores to keep fresh film in coolers - the one in Yodobashi in Tokyo was / is a popular photo location (I am not sure whether they are still open to business).

There used to be very special film emulsions susceptible to fast degradation - the most famous probably being Kodak Aerochrome that had to be kept refrigirated at all times - but they are gone now.

For more ordinary (still pro grade) film the cold storage was of most importance for color reversal film, where any color shift would be final.

For negative film this is not such a huge problem, as a slight color shift can be corrected when printing. Consumer grade film (the yellow Kodak boxes displayed in touristy places) was designed to handle bad storage well.

B&W film is pretty robust, and with a few exceptions (infrared material and Ilford Pan F) should not develop degradation issues for months.

As for your secondary (it really should be separate) question of a manufacturer / distributor held responsible for a faulty product:

This happens from time to time. The standard practice is that your film gets replaced, very few questions asked, but nothing more - i.e. no damages or cost of reshoot.