Poor CPN and support

Hello all,
My mum who I have been looking after for 3 years has had no support from her CPN or contact for the last 7 months since her last meltdown. I have rang up and requested her to come and see my mum but she is useless and only ever suggests respite but due to 3 horrific experiences for my mum in local homes this is no longer an option. I want to request a new CPN as I have no faith or confidence in this CPN. Any advice?