Twenty-eight female guards were unfairly dismissed by a security company because the client‚ Metrora.
The aspirant kings who applied to the Nhlapo Commission to be accorded the same status as that of King Goodwill Zwelithini might lose out if their claims date back to before 1927.
The commission has written letters to four clans in KwaZulu-Natal asking them to give more grounds on why their claims should be considered.
The five clans who had submitted their claims are Nhlangwini, Amangwane, Tembe, AmaHlubi and Mavuso.
The AmaHlubi clan has already met the commission to present its case.
The letter from the commission says the submission for claims highlights things that happened before 1927, while the commission is looking at disputed matters from September 1 1927.
One of the aspirant clans, Amangwane, said they had received the letter from the commission but said it was not clear to them what was wanted.
Clan spokesman Khumbulani Ngwenya said the commission had lost its obligation.
"They only perused our submission as they indicated in their letter.
"And they cannot consider our claim because they do not read with an understanding," he said.
Ngwenya said Amangwane could not abide by the culture of the Zulu people or their King Goodwill Zwelithini while they had been robbed of their identify by colonial masters.
He vowed that they would take the commission to court if it failed to respond to their claim appropriately.
The Nhlangwini clan also confirmed that they had received the letter from the commission.
Clan spokesman Gladman Ngubo said they received the letter last Friday.
He said the clan asked the commission to send the letter after it was leaked to the media before they had received it.
Meanwhile, Inkosi Mabudu Tembe said they had not received any letter from the commission.
Attempts to get comment from commission spokesman Welile Khuzwayo were unsuccesful.
The commission was established by President Thabo Mbeki to look into traditional leadership disputes.
Initially it was led by Professor Thandabantu Nhlapo, but now it is under Professor Mohlomu Moleleki.