Irate customer

I am so fed up with your customer service, went to buy at KFC on the 24th of April using my Capitec card. The transaction came back as a declined and had to pay again.... surprisingly both transactions went off my account. So I call your customer service to have one of the transactions reversed back, sent through the declined slip but nothing was done a few days later I go to the branch and I am told that I will have to wait for 30 days for the investigation to be completed , pay 80 bucks and might not even get my money back. So what frustrates me the most is that I called your customer service centre and explained to them what happened, I have received the worst service ever ...from being sent from pillar to post and still not have my money back! The latest excuse that I got is that my declined slip doesn’t show enough information regarding the transactions that took place.... am I supposed to draft one myself? .If this is how you treat your clients then I rather not be one of them.