We going to next step - writing the complaint to the Ombudsman. Please Write the Support Letters if you can! And send your evidences of Cruelty from RSPCA side. 
We fight not only for saving animals, we fight about our freedom. Otherwise they can not only kill your pet, they can break into your property, hurt you, your family… That is also can impact of your future. If they decide your mum or daughter suffering from pain - they can help you to put them down. It’s that future what we want to live?!