Fnb Service is very poor

I bank with Fnb, I went to checkers on the 18/10/21 to purchase a few groceries, I swiped my card once the transaction went off of that amount however when I went out of the store I noticed the same amount went off again, went back to checkers it only showed 1 transactions and they referred me to my bank. I spoke to 1 of the bankers who informed me to dispute it on the app of which I did, I never received my money or a call from fnb till this day decided to phone them today spoke to Tendani Phovhogi who told me to fill in a form, I don't know what form and why I should be given a run around about my money. I would like someone to sort this out asap.