unwilling to assist with their own mistake

By far the worst experience ive ever had with any service provider. where do i start? Discovery medical aid deposited money for a claim, into a wrong account for and they are doing nothing to assist. Everytime i call in for assistance they keep telling me that there's nothing they can do. My payments are made from my account Mrs N Bhoopal, they had payed the money into my husbands old (closed account) Mr RS Naidoo . I've been to the bank twice already and i feel as if I'm being pushed from pillar to post by Discovery Health. My Husbands was the main member of this medical aid but he removed him self from it over 6 years ago, ever since ive been the main member and payments been made from my account.