Just keep trying some OG's can be a bitch to clone I've had OG's take 21 days + in dirt to root. My suggestion would be to take more cuttings, if the leaves have fallen off that's not good. Take twice as many cuttings as you need, persoanlly I take 4x. and choose the best looking clones when rooted the rest get tossed.
I'd start fresh and find some sort of humidity dome to trap it in, whether that be a ziplock or plastic tub. If the leaves are falling off it would seem like the cuttings are too dry above the cloner, that's my 2 cents anyways.