No forum script or option, and no support for your router, will terminate a stream that others send to you.
You need to ask the support for the sending system. Good luck with that!
I contacted upstream and they advised bgp-community blackhole, they shared with me the bgp community and I have created /32 prefix with the set-bgp-community which is my IP received all the 300Mbps capacity. It also shows on the bgp-advertisements. However when I torch the WAN interface I am still receiving the attack on my /32 IP.
Any other suggestions?