Bad service on deduction

I have paid my tracker , currently been sent a letter (Invoice) that I am owing R429,82 .

When I have that debit order when it was double deducted even , so how do I owe when I have paid ? Clarity is required . Always there is a discrepancy when I am not even accountable I have paid yet should my car be ****** then you guys won’t even assist me because I have arrears when I have paid … I am agitated where I am resolve this issue .