Deceased Estate: Business Account

My husband passed away in March. I have be going back and and forth with FNB regarding the closure of his Business Account. Instead they only claimed for his personal account which is on a negative balance. I have submitted all the documents they asked of me, I have even escalated it to heads of departments. I don't know what else to do, I have gone to the branch many a times and all the do is keep refering me to new person. Bare in mind they all have their own turnaround time and I have kids to feed. I am not claiming for a policy here. I would just like to access my late husband's account so that my kids can eat! I came across a client who was going through a similar situation at the branch and o think it's absurd. I am glad I do not bank with FNB because that means my kids would be faced with the same problems when I die. It's sad because this means a lot of people's funds who are deceased never get to their families because they make it almost impossible. I am disgusted. We are grieving, we should've have to go through this!