Bad service

On 12 March 2015 we filled up diesel drums to the amount of R1683.53. We are contractors in the area and spend approximately R30000 per month at Total in Hluhluwe. That morning I was in JHb and my foreman filled up, a sms was send to my cell phone to notify me that the transaction was approved and the money deducted from my account. 3 minutes later an amount of R1700 was withdrawn from the atm at the Filling Station. I phoned my foreman to inquire about the transaction whereby my foreman told him that the staff at Total has indicated that the transaction didn't go through and he is going to pay cash. The manager at that time told him that he will keep the money separate in an envelope until the matter is resolved. Since then I have produced 4 bank Statements clearly indicating the transaction, being back and trow to the Filling Station more than 20 times and still no refund or finality on the matter. Since the incident they've changed management but still just empty promises of call backs that never materialize. PLEASE ASSEST