My account got hacked

Hi, yesterday when i tried to login to my account i saw that my password was changed so i tried to change it back, but it wouldnt let me. So i check my email, and i saw that there was a new unverified email (one that is not mine). So iam pretty sure my account is hacked, but the strange thing is that iam still logged on to my account on the league of legends website (thats why i can write this post). I dont know what is going on, and i would like to recover my account, but i cant login to the support site can any one help me with this ?

thx Matteo