Healthcare NZ provided home care and support to vulnerable people for multiple District Health Boards and managed 24-hour support for people with disabilities.
The workers affected by this proposal were home support coordinators and admin staff.
Ollington said their biggest concern was the hinderance this change would have on the wellbeing of many of the business's vulnerable clients.
He said as many of the clients suffered disabilities, the call centre approach could be "really difficult for them" as opposed to the face-to-face contact the regional offices provided.
The new model could mean the company would lose a large amount of its client base, which would "not benefit anyone", Ollington said.
"HealthCare NZ offer a really important service for the people they support."