Mr Doesburg, who is supervising the introduction of cameras to up to 6700 taxis around the country following the murders of two drivers and assaults on many others, said his organisation had been unable to contact the Christchurch supplier.
He expected to meet a lawyer today to discuss a possible case for the Commerce Commission, but he needed to confirm the man had disappeared before removing him from the list of approved suppliers.
Whangarei taxi company owner Robert Gregory, who was earlier granted a seven-day reprieve until Monday, said he had also been left in the lurch by the supplier.
He had eventually received cameras for his 26 cabs, but not mandatory panic buttons.
Mr Doesburg said Discount Cabs could not expect any more exemptions because he believed Mr Webster had left it too late to meet the original deadline of August 1 to ensure all his cabs complied with the law.
"Because he has gone very late, he is on his own."
A relieved Mr Webster accepted last night that he had "misjudged" the time needed to ensure an adequate supply.