Wrong amount debited and no refund

I have called and logged numerous requests, Tracker signed me up for some additional service that I did not consent to when I moved the tracking unit from my old car.to my new one. On 29 November, a debit order of R240.64 was deducted and on 1 December a debit of R340.08. I called about this and was told it was an error on their side, and it would be refunded. On 18 December I only received a refund of R288. I logged a ticket on 18 December to ask why my refund was short (R340.08 - R288) and I am still waiting for an answer. On top of that, I can't open any policy document as it's password protected and my ID number nor policy number opens the documents. Why is tracker over charging me and where is my full refund?