Useless sars

I would like to complain about that **** called sars i used to work for an American NGO called Acils i was there from 2008 to 2013 than I was retreched i informed sars about it, two years later i borrowed money from my neighbor to go to their offices and i was told that i haven't paid tax for two years i showed them proof that I was not working than the story changed they said I didn't pay when I was working than I had to come back with proof that I paid when i was working, the story changed again they said at work they used to give me a car allowance and it was not taxed which was not true i never received a car allowance in my life, they demanded that I should go back to my former employer to get a letter to confirm that, that employer is in Johannesburg i am in Durban i am going to waste more money on that than they change the story again,i am so fed up with them.