What can be done if annuity company refuses to act on a request by the owner or the power of attorney agent?

My grandfather has an annuity that he lives off of in his name. His son recently filed guardianship proceedings attempting to get him declared incompetent after he gave a gift to his daughter (bought her a 14-year-old car). I went to the emergency hearing where the commissioner refused to issue any temporary order or freeze his assets stating that he was clearly competent and defending himself quite well by himself. The commissioner forwarded it to a judge and set a hearing, but after I filed a restraining order and request for injunction, the son dropped the matter. The son sent a copy of this filing to his annuity company, and now they are refusing to release him or me (as power of attorney) any funds citing that a question of competence was made. I sent them the dismissal documents, and they are still refusing to act on his request to release him any funds. This is all he has to live off of, and the facility he lives in costs upwards of $5k per month. I want to know what remedies I have for getting them to honor not only my request, but the request of the owner himself to disburse funds.