KUALA LUMPUR, July 22 -- Former AmBank account relationship manager Joanna Yu Ging Ping told the High Court today that she would be contacted personally by Low Taek Jho on behalf of Datuk Seri Najib Razak when the then prime minister's credit card purchases in Hawaii failed in December 2014.

Yu, who was at that time the relationship manager of Najib's accounts with AmBank, testified that the fugitive financier contacted her on Blackberry Messenger (BBM) on December 23, 2014 and that their chats included messages that were forwarded from a person that signed off with the initials "MNR".

"I received a message from Jho saying the Visa platinum credit card was not going through, and the message included instructions to call AmBank and their...