As I was reading your note I thought I already knew what caused your problem but then you said the word "mesh." I do alot of taping and never use mesh tape, for that very reason. The only way to really fix is to cut it out and start over. You can't just spackle or mud 'cuz the cracks will eventually reappear. Another idea although also alot of work would be to put tape over the bad tape then stucco the ceilings and wallpaper the walls.