Dissatisfied and lost money

I go to shoprite to do my shopping , but the past Friday i got there and after ringing up my grocery i realized that the promo didn't go off. when we checked the slip we came to the conclusion that one of the combo products was not on, so i asked the cashier to do a return an the combo products that was rung up and then ring it up again including then the product that was missing. she called the supervisor on duty and she pressed something and then the code that she put it didnt work, so she called one of the managers and when she came she just put in the code, not knowing for what she is putting in the code. the whole transaction was on a refund on the till but no slip came out for them to refund me. they didnt know what had happend so they called another lady from the office which then did a spot check on the till. they counted the cash ,but my transaction was a card purchase. i waited an hour then they concluded that the till balanced. i asked but where is my money if you have refunded the money? the manager then told me that the money would return to my bank account and that i heve to repay for the transaction. i told the manager that i cannot pay again cause they didn't return my money that I've already paid. the manager insisted that the money would return. i then ended up paying again and left the next day my money has not return into my account so i went back and told the same manager that in my experiences in retail, which i have a lot of, i have never came across a situation where a retailer does a refund and the money goes back to the customers account. i also asked he about the cashing up that was done end of shift, her response was that she didnt hear of any issues, but she knows that there was an issue at that till the previous day. why didn't she check on it or inquire? she told me that the money would return to my bank account. i was getting really angry and decided to leave. Monday i went to the bank got a statement and went back found the same manger different supervisor. i explained to the supervisor the situation and she called that same manger. at the supervisors front office the was a lady called Danisa and she overheard what i was saying. this manager now changed her story of the money would return when she saw my statement. this lady Danisa went into the cashiers office to check the cashing ups of Friday then went back again to check the card machines transactions and there she saw that the money id there in their accounts. the refunded my money, but whom do i hold responsible for the petrol that I've wasted going there twice plus i had to pay to go and draw a statement to assure them that the money didn't return to my account. this is ridiculous that they can just say come back, but they don't know how far i stay from there. Shoprite please give proper training to your supervisors and cashiers to assist the customer with friendliness and patience. And i Thank You