Very bad flexibility in service

My father passed away a little over 2 months ago. He was paying for my cell phone contract as well as his own which is where this gets difficult. I went into the Cavendish branch shortly after he passed and tried to get my account swapped into my name so I could pay it. They said I needed 3 months bank statements to show I could pay the contract. I'm finishing off my masters so don't have a job but my Dad had a life insurance policy that once invested would allow me to live off the interest monthly while I finish my masters. This would only come into affect at the end of December so I couldn't do anything. I informed the branch that he passed away and had a copy of the death certificate but Cell C are still debiting my Dad's account so clearly this didn't make its way anywhere. I then tried to settle the arrears amount and the bank account details they sent me were incorrect. This needs to be sorted now.