Have you talked with the company that you bought the unit from?
Another reason for untreated water at the faucet could be low flow and slippage through the resin.
The system could be over sized or under sized..
If it is an o ring or seal in the main body there is every chance that it is not under warranty ... as that is the water taking out the seals or o ring.
Now I might be wrong, but the above are just my thoughts on the matter.