Changing ownership of contracts after father's death

It has been an excruciating few MONTHS and there have been countless visits to MTN. My father passed away last year January. My brother and mom's contract are in his name and my brother has been named executor. After going to MTN with all required documentation ie. death certificate etc, MTN has NOT SUCCESSFULLY placed these contracts in my brother's name. My mom's sim card officially gave in on Thursday. It is obviously damaged. My brother visited MTN again today to be told the systems are down and that he must come back tomorrow. How much more of this nonsense must we take???