Workers have been picketing outside an Auckland Pak'nSave this week after their redundancy deal was trashed.

In July, employees were promised a lump sum payment which was first halved, then totally revoked. 

FIRST Union Organiser Mikee Santos says the workers deserve better treatment.

"They're losing their jobs, they're in limbo, and they don't have any assurance of getting another one. And then at the 11th hour... they are getting steamrolled."

The Henderson branch is set for demolition in October so a bigger one can be built.

"The right thing to do is call the union and start talking, start negotiating again," said Santos.

"Put the offer back on the table and just pay everyone the full redundancy package. I think that's the right thing to do."

Employees are picketing outside the branch this weekend. Santos says some of the workers have been there for over a decade.

"They are just getting kicked in the face. Initially, [the owner] made [a fair offer] and later on retracted it to zero. That's why all the members are gutted."

The new supermarket is set to open in 2021.