Refusing to cover the medical expenses

My husband was admitted in the hospital for depression attempted suicide, referred by our GP for psychiatric evaluation and counselling, a week later for nor authorization, they contact my husband to advise that they decline the claim due to undisclosure for hypertension. This silly excuse they giving has nothing to do with the reason why he was admitted in the hospital at the first place. Now we are sitting with a bill of more 30K. My husband is unemployed I'm the bread winner where do I get the money to pay the hospital? I need answers ASAP Discovery show yourself now. If Im not getting response by tomorrow I'm taking it up with the health ombudsman