Unknown petrol purchase on my account

On Thursday(07/09/2023) morning around 2 am i received a bank notification sms that a petrol purchase of R200 has been done on my account using my bank card at Total Garage, Southgate pmb. That puzzled me because it was ealy in the morning,at home sleeping and the card was with me in my bag. When i called the bank in the morning i was told to go to total garage and ask for a refund, there was a glitched that happened on Saturday the 2nd of September 2023 when i was filling petrol, I was double charged. However when i went to total garage, Southgate PMB they disputed the transaction, they say its not showing on their side. Now where is my money, because i want it! what happened to it,? please investigate!