Netstar unfair treatment of customers

I am very disappointed in Netstar, when a company with such a big stature and credentials treats it's customers with contempt it's utterly disgusting. I've been their member since they fitted a tracking device on my car since 2016, for which I am currently paying R185.50 monthly. To my surprise, last month I was issued with a statement specifying that I owe R371.00 as a result they made double deduction on my account. When looking at the statement I saw two different accounts of which one of them does not belong to me, meaning they think I am stupid enough to pay for someone else's account. They sent me emails in this regard and I rep**** by asking what is the R371.00 for, but they never rep****. This goes to how they treat their customers, it's shows great disrespect. The question is how could they make deductions that I don't know about without my permission? I mean this is my money, I'm the one who pays, they don't pay me. To put salt in the wound, they cancelled my membership for no apparent reason, how unprofessional? I'm just disappointed and I need answers.