Sonos devices are becoming increasingly popular in Russia. Sellers widely advertise the ability to manage Google Assistant as a competitive advantage. However, they do not say that Google Assistant is not available in Russia. I found out about this only after the purchase and this may be not only a reason for a refund, but also a lawsuit.
There is no point in selling devices with a voice assistant in Russia, since it is not supported. Customers pay money for voice control but can't use it
Good luck with your lawsuit.