Buying followers is not safe at all, In the long run, you will find out your page has got some issue in reaching people and getting the right audience, If I should suggest what you can do, I would say changing device can help, sometims IP do have effect on how your Content or Audience grow..
I would love to ask, Do you have some content posted on the FaceBook account? If actually you've posted some content, you can check if it's increasing by checking the insights and if not you should try posting content on another Devcie and check if it reach better. Hope this help