I think my father got hit hard at the navigation store.

3 years without hi-pass sound? I went to the place where I replaced my navigation auxiliary battery, and they said I went to the same store next door. While I was working, my father called me at 4:57 p.m. and told me that I was busy at work and to call him later. Then at 5:20 p.m., he called me again. So I asked about Hi-Pass, and he said that the voice was just turned off in the settings. But what about the 4-channel, sudden-start black box, and auxiliary battery fuel efficiency? I paid 3 million won for this and that. I was working suddenly and I had a lot of money, so I tried to cut it off and just looked at Naver to see the approximate price, and even for a well-known brand, it was about 1 million won.. I don’t know the rough estimate. The existing qxd iNavi was over 50 years ago. So, I called my father again and asked him if he was doing it for 300 million won. I hung up on him. But when my father talked to the company there, they suddenly said that they had reduced the price by 1 million won to 200 million won. I was angry, so I came to my father’s house and looked at the product sales site. They gave it to me, but when I looked at it, it seemed like they had uploaded it to a smart store at a high price… If they say something later, they set up a website in advance as if they are trying to convince adults that it is worth millions of won by showing it to them (I think), but I think they are doing business like this. It happened right..? I’m so angry right now and I’m sorry for writing so rambling. Please help me on what to do… It’s not a small amount of money, but I feel like I’ve been paid a lot of money, so I’m really angry. I think I did this to not only my father but also other people. What should I do? It would be great if I could get a refund. But I’m leaving this long post because I’m wondering if this will work. I’m sorry for writing so ramblingly.