iPhone 6s Wifi and Bluetooth Bad Signal

I dropped my Iphone 6s like half a year ago, after that my wifi and bluetooth stopped working from range. It gave me messages like “Unable to Connect“; “Incorrect Password“.

I sent the phone to a motherboard repair shop, thinking its a bad wifi chip or something. They told me that they cant fix the phone, they cant find the problem because the chip doesnt have any problems so the antennas.