Also, I don't know what you meant by "...level up quickly so i can gift my friend battle cast prime chogath." But I do believe that that particular item is a skin and skins can not be bought with Influence Points (IP, or the in game currency) but instead need to be bought with Riot Points (RP, Or real money put into the game. Don't mean to be a party pooper but that's how skins work.
Hope this helps, sorry about your suspension,
P.S. In the future, make sure you can plan your time accordingly because the Leaver Buster doesn't have feelings towards "Dinner, Family time, Chores" Or anything of that liking. This time it obviously wasn't your fault. But just in case so it doesn't happen again in the future. See you in League!