Instalock/ Ignorant

Pretty sure it's come to everyone's notice that there are always people that instalock, doesn't matter if it's in blind pick or ranked. I've seen people assigned JG but instalocked Mid instead. He or she isn't even duoing with another person, they just instalock a champion with a role that they wanted by didnt get. Let's say my desired role is Mid, but this other guy instalocked a mid champion leaving me having to choose his role, which sometimes i might have never played that role. I can't just dodge cuz I'll lose LP, what other options do I have?

Suggestions?