Highly Disappointed with CARTRACK

I am highly disappointed in Cartrack.

A few months ago I had some arrears ony account. I was told telephonically and via watsapp to pay my arrears amount less 30%, which I did on two occasions. So for the last couple of months I've been paying R99 on my account consecutively, keeping my account up to date. Since Last week I've been getting calls from accounts dpt consultants, telling my that my account is in arrears, whereby I told them it is not in arrears, they've sent me emails to tell me that is it in arrears, yet they are ones that told me to pay the arrears amounts less 30%, which I did. Now they are harassing me to pay arrears amounts, of which my account is up to date. One minute the watsapp service will send a massage to say, my account is up to date, the next minute they email me to say I'm at default. Which clearly means someone at cartrack is not doing his or her work, improper communication between staff members. Can someone please help me in this regard.