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@miro_o
+1 for them being a good bike shop, and nice people.
It may be worth asking them to check that it's a track lockring they've fitted. If they need to buy one in, then buy dura-ace. Most likely though, they just need to tighten it.
Personally I always re-tighten after 1st ride on a new fixed wheel, and as said above... tighten the cog really hard, using a threadlock product helps too. The lockring needs to be super tight too, but it wont hold the cog on if the cog is loose though.
Also... and this may be why the staff in the shop think your a dick... you need to be riding with a brake from day 1 buddy. If your bike falls apart (quite possible by the sounds of it) and your brakeless - your fucked.