Paid a crazy amount for the small amount of meat

i bought meat to the amount of R462.00 and i had R400 worth of stamps that i was paying with, i gave them my bank card for them to take only R62 from it , guess what they took the whole R462.00 from my bank account and i only figured it out two weeks later. I went back to the butchery the manager by the name of Fernando told me there is nothing they can do. My hard end money went drain the drain just like that.