After you have reported the incident you still have a duty of care to your patient. If you feel that your patient is still at risk then speak with your line manager regarding your concerns.
If you feel your line manager is not taking appropriate action, or you suspect your line manager of abusing a patient then most company policies would state that you would need to contact the regional manger.
You would also need to contact an inspectorate body.
In England, it is the Care Quality Commission (tel. 03000 616161);
In Scotland, it is the Scottish Care Commission (tel: 0845 603 0890)
In Wales, it is the Care and Social Services Inspectorate for Wales (tel. 01443 848450); and
In Northern Ireland, the Northern Ireland Department of Health, Social Services and Public Safety - Social Services Inspectorate (tel. 0289 052 0500).
As part of the process for reporting abuse is to contact the local care standards inspectorate, the person you reported this abuse to should have done this and if they have not, this in itself may be considered abuse (neglect) if it should be the case that abuse or dangerous practice is being carried out.
Hope this helps