My money that I work for

I'm so ****ed cartrack have been sending statements saying I'm owing an amount of R3001 for tyres that I bought .....collections department have been calling frustrating me .....telling me to pay....Guess what I did not buy ANY TYRES, I took my time called accounts department told them I did not buy or install tyres from them, the lady told me she will investigate lol still they calling me I'm owing ...you'll better fix this or else you will speak to my lawyers...imagine money that I work for...for my kids..family u think u can just take it, try me ...if you can't do your job ..I'll do it 4 you...useless accounts dept...ND company...it's a company loss face it ND investigate who has your product ND who loaded this money.