biggest concern

i play along the lines of silver 2, ish, give or take people from G2 through S3.

my major problem is people ignoring what i say. no matter what i say, how nicely or politely i word it, or just right out ping, people refuse to change what they are currently doing or have planned on doing.

i ping MIA, the river, danger, bot laners do nothing, they die 5~10s later to a 3v2 or 4v2 w/ jungler help. i saw it coming, i warned them about it, and they did nothing, why does this happen?

i do believe this is a major reason why i lose at least some games, i just cant get other people to listen or work with them, its literally based on me carrying them in this situation, and being the one to roam, or the one in the team fight that makes the difference by insta picking their carry, etc.

what can i do about this?