They’re robbing me blind!

I would like some advice or help on the Csa Robbin me blind

I have been havin on going problems with them now for over 3 months in them not noing what they are doing I having been payin the Csa now for over 3 years without any problems as I work for network rail and they seem to take what they want out my wages I recived 3 letters over 2 months ago saing in one I owed £8500 the outher saying £5000 then the outher saying I owe £500 pound I filled a complain with them reg this matter with them and they admitted a mistake now they are saying I owe them around £1500 pound so they decided to take 40 persent out my wages last month without any warning or letters in sayin so as this as left me unable to pay my mortgage this month and bills

I fill very hard done by if not robed in them doind this to me seems very unfair they can just do what they like and it can’t afford to pay a solicters in helping me with this matter they just don’t no what they are doind to me it’s making me fill so ill and sueasidle reg this please can I get help in matter Mr s burge 07507850651