Hello, Monni -
I am guessing you reside in South Africa.
Fixya.com receives questions from people worldwide. I am answering from the USA.
Since I have no idea where your father resided before he passed away, I am unable to direct you to the correct municipal government website.
Since you know where he resided, I suggest you look up the telephone number for the municipal government where your mother now lives, make a telephone call during weekday office hours, and ask to be connected to the proper government agency so that the account can be changed to your mother's name.
Note:
Fixya.com is a website intended for asking and answering questions on how to go about REPAIRING THINGS.
I chose to answer your question as a kindness.
Best wishes.
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