i was ripped off

so i spend 20 bucks to buy rakan ive been trying him out on free rotation 20= 2800 rp and i go to buy him 975 and when i do i get charged 2x your not supposed to be able to buy a champ twice and its so frustrating ive put in a ticket on my other account and gave them the name of this account and what not idk if i should put in a ticket on this one too look i just want either a refund or compensation i always spend money on riot stuff please riot help me out