I work and have paid for all my children, why can’t they?

I have been married twice i have 6 children 4 from my first marrage2 from my second. i have also been divorced twice i claimed csa for the first 4 rang regular up dating but not recieving anything. after years of frustraition i was told they had made a computer error i contacted the indipendant case examiner and recieved a thousand pound compensation that i may add dose not keep 4 children for 14 years!! iwas then told that as the older ones by this point had left school that he just had to pay just over a thousand pound arrears and that was alldown to years of there incompitence! but then not learning by there mistakes when i divorced my second husband and informed them they then again managed to make a cattalogu of errors. the first was not following up with information they recieved. second they never rang me back when they said they would. when they was informed about the fact he had his own buisness and was claiming benefits fraudulantly nothing was done about this. he lied about his earnings was given proof of this and nothing was done.

This has gone on over 12 years and there has been too many things to mention that they have failed to do they even told me that they had lied to me because they didnt know what to tell me! but the final straw that has made me contact the indipendant case examiner again was when my ex husband was on homes under the hammer bragging about his buisness how much he paid for a house and had spent on it and how much he intended to get from it and when i informed the csa of this i was told they could not use this as proof! we this is admission from his own mouth and they cant use it what else can we do? i work and have paid for all my children and so should they.