We have a Natuzzi swivel chair and little ball bearings have fallen out ?

We have been having difficulties with a Natuzzi leather swivel chair. Metal ball bearings have been falling out and the chair has become unsafe to sit in. It has completely come unbalanced. Though it was purchased several years ago we brought it into the livingroom just a few months ago. Macy's said that they could do nothing about it as did the Natuzzi company. It is useless to us as it is and would like to be able to fix it. Any ideas? Thanks.