The authority ordered Mr Keepa to pay $3500 towards the company's legal costs.
Mr Keepa then filed a further challenge to the authority's determination with the Employment Court which was heard in Tauranga over several days in August and September this year.
He sought a $10,000 compensation payment, reimbursement of $7680 lost wages, plus costs.
Mr Keepa claimed his employment ended as a result of unjustifiable actions taken by Go Bus, which included not affording him the right of a support person at a disciplinary meeting, and not advising him of the consequences of failing to follow instructions.
He also claimed a Go Bus Transport manager prepared a dismissal letter before the disciplinary meeting, pre-judged the outcome and did not act in good faith.
Go Bus denied the allegations and said the termination was by agreement.
In his October 12 decision, Employment Court Judge Mark Perkins said he found the authority was correct in dismissing Mr Keepa's personal grievance case.
"There can be no suggestion in this case that Go Bus gave Mr Keepa an ultimatum of either resigning or being dismissed. Nor could such a circumstances be implied from what occurred.
"He was not constructively dismissed. Nor was there any unjustifiable action by Go Bus to Mr Keepa's disadvantage," Judge Perkins said.