Sorry to hear of your premature chain/sprockets wear Pastor. There is no real # of miles a chain/sprocket set will run before replacement is needed, as there are too many factors that can contribute to early wear. Something caused your set to wear faster than normal. That "something" could be difficult if not impossible to determine at this point, however.
As said above already, these are considered "wear" items by 99.9% of manufacturers.
If they indeed need replacement, you'll have to bite the bullet and replace them.
If it were me in your situation I'd now look at a good/quality chain maker, (Diamond, or Tsubaki comes to mind), and spring for their top of the line o-ring chain. Going cheap will get you by for awhile, but for long term happiness, quality overrides economy when it comes to chain life in my opinion.
Additionally, correct installation/alignment/chain tension are three critical components that must all be right in order to get max life from the new chain/sprockets you need.
Some o-ring chains require very little lubrication but cannot be run dry or failure could occur, perhaps prematurely, again.
Good luck going forward but I wouldn't waste my $$ on attorney fees for this issue, if I were you...