Hi Percival
I have worked for Contractair in the past, found them decent enough always got paid even if the client didnt pay ( which they invariaby didn`t) why don`t you ask them why your salary is divided are you saying that they didnt pay you the amount they said they would, also you should not work ever without signing a contract it is your Insurance if anything goes wrong..... if you dont sign and have an incident then............ doesnt really bear thinking about does it. You say you have discovered this after doing the work well
seems a bit strange to me they either paid you or they didnt...............