Samsung — Fraud by local repair

I called customer care and i was told that technician will arrive same day . Within 30 mins some manager clsaying he is from samsung called me and asked me for location which was shared on WhatsApp. After few mins recived called from technician some.local repair guy from good service stating that he is coming from samsung to check. I was told to pay rs 400 for visiting to which i was okay. The guy named Abrar came and told me that samsung socket sensor is gone and needs to be repaired which cost 3600 per part . He also told me total cost would be around 10k including service charge( 550)+ visiting charge 400 and repair 7200 and he will heck for some discount from company. I ended up paying 9400 thinking that samsung being such a reputed brand can't be wrong and they are experienced technicians so they know better. After reciving invoice it said same local company called good service and when i called he said he will sahte samsung invoice. He edited his invoice and added Samsun on it. When i said this is wrong and i need samsung invoice he said he will call me. I have lost my hard earned money on the name of brand. I hope my complain will be looked into utmost priority.