Dodging game

What is the easiest way to dodge game? ike should I always close the client? The problem is in low elo, there are players who thinks that they can replace their lane without asking.... In my ast game attempt; there was top player who ask ADC if he can play adc. Adc says no; so when the top player pick Vayne there is only one option exists I need to dodge... Thanks god I was done with my promotion just before this game but if I was on promotion I would be really pissed... I think Riot should tolerate dodging during promotion more....
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