CSA not got a clue

Spent 2 hours on phone for no one to answer first of all and the csa have worked out all of the figures based on a job I last worked in 2019 so calculating that I owe 400 a month when I was actually unrmmployed for a while due to covid and now the debt which they are still calculation from 2019 even though have sent proof and now owe over 3000 pounds and on collect and pay so they charge me for the privilege of getting everying wrong . I have never known such a awful firm to talk to , no one knows what there talking about and get passed from pillar to post … Makes me so angry and can why why people want to kill themselves when they don’t have a clue and putting people in very ugly financial situations