When asked if he often said ''b***h'' near his phone at 2am, he responded there was a lot of ''cussing and swearing'' at his house.
''I did not deliberately call Eliza Zagaglia, and that's all I've got to say,'' he said.
Zagaglia told the Queenstown District Court Ngawhika did not take her decision to end their marriage well, and she moved from Arrowtown to Te Anau because she felt unsafe.
''I just wanted to get on with my life.''
Ngawhika said he had called and emailed the complainant a few times, but only to discuss shared property and possessions, and their legal options for dealing with the end of their relationship.
He also told the court there was a second potential explanation for the multiple phone calls: after his police interview last February, a friend had noticed the call-forwarding function on his phone was activated.
He had then recalled the complainant had set up the function soon after their wedding, while on holiday, after his phone's battery became low.
Although he had deactivated the function immediately, he noticed it returned whenever he switched his phone off and on again.
His suspicion was raised further when several people told him they had left voice messages, and he had checked and found nothing.
Prosecuting Sergeant Ian Collin asked Ngawhika why, if that was the case, no one had told him they had ended up talking to his former wife after trying to call him.
''In 10 months of what you say is a call-forwarding operation, do you not accept that's an incredible situation?''
Judge Mark Callaghan reserved his decision until tomorrow.