Who else can I speak to about my complaint?

You also have the right to complain to:

Commission for Social Care Inspection
33 Greycoat Street
London
SW1-2QF
Telephone 0208 7979 2000

Also

Local Government Ombudsman
The Oaks
No.2 The Westwood way
Westwood Business Park
Coventry
CV4 8JB
Telephone 0247682000