CSA can’t even get simple admin tasks right

Csa have been taking my tax credit info from 2011, the amount has dramatically changed since then.

For the past year I have called them 7 times, sometimes the phone call would last 45mins.

Each time I ask them which year they are taking my tax credits from, each time 2011, each time no it’s changed, each time time ‘we will recalculate’ and ‘call you in 2 weeks’

Each time they do not call me I called up 2 weeks ago and asked the man to look up the notes from my calls. I asked shouldn’t this have been changed? he says ‘yes’ why hasn’t it bee changed he says ‘I don’t know’ I will change it and call you within 2 weeks.

Here I am 2 weeks later, no call or anything, worse than this I have changed my job and I want to tell them, but what will happen this info???