I don't think they should have covered your issue since there were a couple things you could've done prior to the tv falling off of the stand and the stand collapsing itself.
1. Put the tv on an actual table, not one of those pre-fab stands like you said collapsed.
2. CHECKED what was causing the popping noises BEFORE the tv and stand collapsed.
Any sane, concerned consumer would know to not just sit idly by and then come on a forum and whine about 'I spend so much money at this store, blah blah blah' and expect someone to cater to you.