Humana Insurance Company agreed to pay the Wisconsin Office of the Commissioner of Insurance $750,000 to settle allegations that some of the company’s agents who sold Medicare health and prescription drug plans in the state were not properly licensed and that the company violated other insurance laws. State investigators found problems with the company’s marketing of Medicare products, its handling of claims and underwriting. The investigation also found Humana failed to pay interest on some adjusted claims and took too long to settle customer grievances.