I'm trying my best to remain calm

as title says, I'm trying my best. But people are tilting me by flaming and doing bad decisions in game even if I tell them not to do it, I warn them and they still go after their objective die and feed and this tilts me very bad. Sometimes I even argue but I never swear or insult someone, I just tell them positively to practice, not feed and follow rules and I'm starting to get scared that I'll get banned soon or something and I don't want to lose my honor. Any advice because I'm loosing temper and it's being very hard to play ranked without being tilted! Like in early game I get first blood almost every game and go 6/0/0 but after being tilted by my team and having 1v9 I suck at late game and I kinda mess it all up for myself too..
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