NZ Post is being criticised for its radio silence, after announcing it's withdrawing services from inside 142 stores. 

Despite the changes, 90 percent of customers will still be within four kilometres of an NZ Post store. 

Postal Workers' Union organiser John Maynard says NZ Post hasn't talked about the hubs being set up to provide good services. 

He says it shouldn't be on the unions to promote the positives. 

"It's one thing for the company to adjust to changing mail volumes and people's communication methods, but it's quite another to consistently act in a manner which undermines people's confidence in the postal service."

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• NZ Post to close services at more than 140 retail stores in major urban overhaul