Jacks Hardware went to the ERA and asked for repayment of the money given to Mr Beentjes when the agreement was made in September.
ERA member Christine Hickey disagreed that the full sum should be paid back, but did think Mr Beentjes' actions warranted a penalty.
Ms Hickey said in her decision released this week the breaches of the agreement were "flagrant and deliberate and ongoing".
"Mr Beentjes' emails ... make it clear that Mr Beentjes remains dissatisfied with the events leading up to the agreement and that is what has led to the texts."
Mr Beentjes could have faced a $10,000 fine for breaching the agreement, but Ms Hickey said the penalty should adequately reflect the authority's disapproval of such behaviour.
Mr Beentjes was ordered to pay $1500 to Jacks Hardware and $1000 to the ERA.