I believe it goes like this: "What therefore God hath joined together, let no man put asunder."
The key word here is "God" - obviously. Now. We're running into a semantical problem because your are saying that marriage is indissoluble. It is. There's no record of marriage dissolvement in the Bible because a marriage cannot be dissolved. However, according to Scripture, marriage is attended to and blessed by God.
That in mind, I would like you to explain where it states in the Bible that God will bless a lie, a falsehood, a sham ceremony that purports to be a marriage, but is based in deceit, ignorance, or duress (not custom, but duress). If you believe that God joins together and blesses those who are acting out a grand lie in a masquerade of sanctity, then your point is well taken. If you don't believe that He would do this - that He can't be fooled, and won't be made a mockery of - then how can you not believe that "marriages" based in defect are not really marriages, and therefore did not exist in the first place? Either God joins together or He does not. Either He blesses and joins a lie, or He does not. Take your pick.