Duplicate transaction

I went poured petrol on the 23/03/2015 for R50 then transaction reflected on the 25/03/2015 which was billed twice I then phoned caltex on the 26/03/2015 spoke to Nicolas who then asked me to email slip I then emailed slip today he assured me he'll get back to me around 1pm as he needs to go through the banking first check transaction after. He never phoned I then phoned around 14:30 when they transferred me to his manager who refuse to check his banking for that day to reverse transaction ad Nicolas advice me he was very rude and told me to go to my bank and lodge ***** query then bank will investigate and contact them. It's amazing that a simple error that ocured at the merchant cannot be rectIfield after proof have been provided and now a manager don't know processes of such disputes refer everything to *****. Nicolas put phone down on me I had to call many times while this *********** manager rudely talso to me because Nicolas was giving me run around.