The 25-year-old Mthethwa won the nationwide vote against 23-year-old Melissa Allison to win the eighth local edition of Idols.

Metro FM presenter and Idols judge Unathi Msengana confirmed Wednesday that she was sent an e-mail on Monday by her station manager Martin Vilakazi instructing her not to do any interviews with the Idols winner or any competitor, Sowetan reported.

"This morning [Wednesday] an instruction was personally given to me by my station manager not to interview Khaya. No explanation was given. I had to obey and ask no questions because he is my boss."

Msengana said fellow Idols judge Gareth Cliff, who works for SABC's 5FM, received the same instructions . Efforts to get hold of Cliff drew a blank.

SA Idols spokeswoman Ingrid Lebinburg said she received a call from Msengana yesterday morning informing her about the ban.

"We do not know what is happening. Nobody from SABC said anything to us. We are still waiting for them to come to us and explain."

Mthethwa, who will start work on his album in the next two weeks, could not be reached for comment.

SABC spokesman Kaizer Kganyago denied that the SABC sent an instruction like that. "This is not true and it is ridiculous. We did not issue instructions like that. To start with, Unathi is not even supposed to comment to the media. I am the SABC spokesperson.

"Secondly she is even conflicted by working on Idols when she works for SABC. We had Khaya on Chriselda Kananda's show last week."

Kganyago later called and confirmed that the instruction was given to Msengana and Cliff.

"We decided that Unathi and Gareth do not interview Khaya because they were conflicted. This is clearly a conflict of interests. Idols belongs to another station."

Msengana tweeted today: “We have many people who can int him on our station so its okay. I got play his song so that's important to me!”

M-Net communications manager Lani Lombard said: "Idols has been a topic of conversation on radio stations around the country and Khaya's single has been playing on several stations".