If you feel like someone is not being treated with dignity, respect, and proper care, then do not feel like there is nothing you can do. You can contact your local council's social care department to let them know that you have a concern. If you are unable to reach them, then you can contact the CQC directly, and they will be able to instigate an investigation. The telephone number being 03000 616161 and the email address being firstname.lastname@example.org
Do not let your concerns go unheard. Anyone can raise a concern, and should there be an issue, then it will be investigated and rectified.
Remember, neglect and abuse may not always be visible, and may not correspond to stereotypes of what constitutes 'abuse'. If you feel that someone is being treated inappropriately, then there may be an issue.
If you are interested in learning more, here are some links which you may find useful: