Yeah, if you used a rope to climb down you should be guaranteed a rope-up. That’s a bug and use of debug to leave is (retroactively) authorized as not-cheating.
You should then head back, take the rope down, and make the necessary alterations (as in, if it asks for another rope, give yourself one, say yes, and when it puts you on the lower level, use debug mapgen to remove the furniture and place a rope-up tile on that space if one doesn’t spawn).