The City of Johannesburg apologised to Nelson Mandela and his family on Monday for mistakenly posting a non-payment notice on the former South African president's house warning him his electricity was about to be cut off.
The city, which has faced a barrage of complaints from residents for bungled bills, said the notice demanding payment of 6,468.48 rand ($660) was supposed to have been delivered to a different house.
"The city wants to convey an apology to the Mandela family for any inconvenience caused by this unfortunate incident," it said in a statement.
Mandela, 95, has spent two months in a Pretoria hospital battling a lung infection that has left him in a critical condition.
The location of Mandela's posh Johannesburg home is one of South Africa's worst-kept secrets. It is frequently visited by media and well-wishers who leave messages for a speedy recovery on painted stones outside the residence.