Service provider Cell C was subpoenaed for the records in April last year, but only submitted the records two weeks ago.
State prosecutor Maria Marshall announced on Monday that she wanted to enter the cellphone records, belonging to one of the accused, as evidence.
However, the defence opposed this move, saying it came as a surprise to them.
Marshall said: “The State is not denying the documents were disclosed late. There was no intention on the State’s side to deliberately ambush the trial of the accused."
On trial are Renaldo van Rooyen, 33, from Kuils River and Tawfeeq Ebrahim, 26, of Malibu Village, who are charged with murder, defeating the ends of justice and robbery of a vehicle.
They allegedly bludgeoned Zarah to death with a hammer over money she owed Van Rooyen.
The 33-year-old mom two from Kuils River went missing on 14 March 2016 with her berk's Z3.
PASSIVE: Suspect Tawfeeq Ebrahim, 26, ‘was not involved in car negotiations’
Van Rooyen’s lawyer, Advocate Peter Burgess, was adamant the records should be deemed inadmissible.
“The whole defence is based on the docket. If something is not on the docket then it infringes on the trial and therefore the cellphone records should be excluded,” he argued.
Judge Nuku said he would make a decision on Tuesday on whether to allow the records as evidence.
Earlier, the court heard that Van Rooyen allegedly wanted to sell the BMW Z3 in Bishop Lavis for R1 000.
Taking the stand, Reagan Mentoor said he had taken his friend Van Rooyen around to buyers.
“I thought it was his car or a family member’s car. We drove to a friend of mine in Bishop Lavis," he says.
“Renaldo wanted R3 500 for the car. After half an hour Renaldo said, ‘ my broer, se vir daai man is met salute, hy kan R1000 gee’.
“That’s when my friend got suspicious because why would he [Renaldo] drop the price so quickly and why was he so haastig.
He said Ebrahim was not part of these negotiations.
“Tawfeeq was not with when we wanted to pawn the car and sell the tyres. He was very one-sided when I saw him. He was in another world. One could see he did not belong.
“Tawfeeq never participated in anything and it was all Renaldo’s ideas. Tawfeeq kept asking Renaldo when they’re going home and Renaldo responded: ‘ djy, wag, ons gaan nou.’”
The court previously heard that Van Rooyen also tried to sell the BMW for R400 to a Bishop Lavis drug dealer, who turned State witness. The man said he refused because the car was stolen.