Mistakes do happen and most vendors are quick to correct the issue.
I don't have a lot of experiences with buying juice yet, but I have had some bad ones. I have to admit that the vendors in question--even if their juice wasn't much good--did always try to correct the problems they could correct, like leaking, or mislabeling or missing product. my (albeit limited) experience has been that juice companies, especially smaller ones, are extremely customer-oriented. To their credit, the economic concept of "good will" is not lost on them.