Vivo Mobile India — Wifi speed related

Dear team I have vivo v20. I am getting internet speed max.300 Mbps via WiFi through 5GHz. When I ask your support center they said v20 will support 1G speed but not working more than 300 so I raised complaint .after they said sent log share the screen recording all I sent after they said v20 only support 443 Mbps only like that. Ok that also not getting my device so I asked them sent screen recording from your I want to know your v 20 how giving 443 Mbps upto now didn't sent by them too much excuses only I am getting how they said 1G after how they said 443 who confirm the speed how I know it's true .I have 500 Mbps speed in my home but I can't enjoy with full speed due fake promise given by vivo last two month I struggle this issue