"It was so fast - if they gave us six months or longer we'd be more relaxed, but this was a shock," Mrs Koumaki, 76, said yesterday.
The $730,000 offered for the 718sq m property by Auckland Transport is above a CV of $640,000 made in June. But the couple say they would need at least $900,000 to build anything similar.
Mrs Koumaki said it was unfair of Auckland Transport to restrict its offer to a market price, as the threat of the new road over the neighbourhood had depressed property sales.
Her plight has been taken up by the Redoubt Ridge Environmental Action Group, which arranged for lawyer Dilki Rajapakse to write to Auckland Transport chairman Lester Levy asking for "harassment" of the couple to stop.
Ms Rajapakse told Dr Levy the Koumakis had been "subjected to a barrage of telephone calls and [visits from] unwelcomed officials from Auckland Transport on the pretext of 'helping'".
"The bullying tactics and harassment of my clients by the officials must be stopped immediately," she wrote.
AT property chief Deborah Godinet promised to review the case while instructing her team to make no further direct contact with the couple.
Highway project director Theunis van Schalkwyk said an offer was made in good faith for the couple's property only because they had requested an early purchase due to their personal circumstances.
"There is no compulsion or pressure to sell - Auckland Transport will withdraw from the purchase if they no longer want to sell early," he said.
Although early purchases were being considered in a small number of cases, a route designation hearing by planning commissioners was not expected until late this year, and it may be up to six years before the rest of the required properties were bought.
The rules
• Auckland Transport is entitled to compulsorily acquire properties under the Public Works Act.
• If purchase agreements cannot be reached, compensation is determined by the Land Valuation Tribunal under the act, which requires that landowners be left no better or worse off.