Unfair

My tax number is *** ,last year sars send me an sms saying I owe SARS then they started deducting money from my salary until it was R13000,I went to sars offices in Pretoria North and was told Sars would get back to me, after submitting all necessary documents, they said I wasn't penalised for anything,till 2day they haven't come back to me, then this year last week sars say I owe R1000 then I receive the message saying i must go to refilling something needs my attention and when I checked, Sars say I owe R8000,what exactly is this money coming from, I am a government employee who pays +-R3000 a month to sars,so what's with this monies that I owe sars ,I work with lot of people but I am the only one owing sars.i just don't get it,or must we go to checkpoint maybe our cases would be taken seriously, cause sars is ignoring us.i think someone is busy with my money through sars that's y sars is ignoring us,this is not right,Sars must tell us what is going on with our money,all they know is taking what's theirs but ignoring our cases