In my experience, CEL does not repair or replace damaged o-rings in their print heads because of the cost. At least that is what they have always told me. So I think there must have been some misunderstanding. There are seals on the nozzles that can be repaired, but the o-ring seals can't from what I have heard. So maybe that is part of what happened? Maybe the problem was two different things?
I am trying to understand what happened because my experience with CEL is so much different than what you are reporting.