The DA made its first complaint to the Presidential hotline on Monday, requesting an investigation into the appointment of Paul Ngobeni as a legal advisor to the Minister of Defence, Lindiwe Sisulu.

Democratic Alliance MP Gareth van Onselen claims it took him 80 minutes and six phone calls to make the complaint.

"Ngobeni is a fugitive from justice in the state of Connecticut in the United States," Van Onselen said.

"There are a great many questions about how he qualified as a public servant and passed the requisite vetting procedure."

Van Onselen said the person who registered the complaint was "quite taken aback" at the details of the case and expressed that the man - Ngobeni - should not be practising and should be arrested.

The hotline, launched by President Jacob Zuma as a way of stamping out corruption, received 7261 calls between 9am and noon - or 40 calls per minute - on its first day on Monday.

"We are experiencing high call volumes and are spending the day sorting out various glitches," Zuma's spokesperson Vusi Mona said in a statement.