Debited incorrectly ,already off to a bad start

<p>I Recently aquired vehicle insurance with discovery on the 25/07/2017. I have only had the vehicle for 2 days and discovery as already debitted me for a full month insurance which unacceptable.As far as i am aware insurance is paid in arrears and not adanvance. How can i be debited now for a full month and again at the end of August for the same days. </p> <p> </p> <p>Also they charging me for tracking unit that cant be installed due to no availability which is unacceptable. </p> <p> </p> <p> </p>