NO QUOTE - DID JOB - OVERCHARGED

I contact Samsung 3 Jan in connection with my fridge leaking and they sent ProLad to my house to have a look and provide me with a quote. Ludwig from ProLad arrived there. He opened my fridge at the back and cut off a part of the tube which was blocked going to the overflow tray. He then opened my freezer at the front and dismantled it completely. I was busy with my kids and he just went ahead. When I got back to him he gave me the piece (he said it was a switch) he replaced and said it was R1500. R820 for the part and R680 for labour and call out. I was never quoted or informed of the problem, he just replaced it. He had to leave so asked that I transfer it immediately. I did an EFT payment and he left. The afternoon my husband got home and asked me what was done and how much I paid. I told him and he was shocked and searched the internet for this fuse. The price was R80. I then contacted Samsung and they provided me with details of another Agent and I contacted them. They gave me a quote of R40 for that same part. I then contacted Samsung and informed them of this and they said they will take it up as it is unacceptable to be overcharged so much. I have had no news until today.