A Lewiston-based customer service and management firm has acquired a South Portland company and its 80 employees from Dr. Newton’s Naturals for an undisclosed sum, the company said Friday.

Jason Levesque, founder and CEO of Argo Marketing Group Inc., said his company will continue to provide sales and customer service for Dr. Newton’s, a vitamin and supplements maker that is moving from South Portland to Westbrook. All 80 of the call center’s employees will keep their jobs with the same pay and benefits under the new ownership, he said.

“They have been offered, and thankfully all of them have accepted, jobs at Argo,” Levesque said.

Argo Marketing Group will relocate 50 of its employees from downtown Portland to the contact center, he said, adding that the company plans to do more hiring in the coming months as it takes on new clients.

In addition to its Portland-area staff, Argo Marketing Group has about 100 employees at a contact center in Pittsfield, and another 300 in Lewiston, Levesque said. Founded in 2003, the company now has about 580 employees, he said.

The call center divestiture will allow Dr. Newton’s to focus on marketing and product development, Levesque said, while creating an opportunity for Argo to grow its contact management business.

“This expansion dramatically increases our capacity, and the new members of our team have a unique skill set honed over the last 18 years,” he said. “We are now poised to handle a much broader variety of customer contact clients expanding our already broad reach in the marketplace.”

As part of the sale, Dr. Newton’s will move its business operations from the call center facility at 53 Darling Ave. to 26 Thomas Drive in Westbrook, Levesque said.

Argo provides a variety of services including direct response, electronic communications, social media and brand management, and government/political strategic plans. Its three Maine-based contact centers operate continuously, providing phone support, email, social media, text and live chat in multiple languages for domestic and international customers.