Account hacked, using my RP to gift himself skins

Hi, I don't know where else to seek support but here. I'd like to notify that today when I logged into the client, there was a notification that says 'Im Shaco GG has received xx skin' 4 times. I have never heard of this name 'Im Shaco GG' and is not in my friends list. When I wanted to buy a skin, I discovered that my 3000 - 4000 RP is depleted. It dawned on me that somehow this person must've hacked my account and gifted himself skins. I check my gifting history and true enough this is the case. I have since changed my password. Riot, how do I get back my RP and prevent this from happening again? I am now afraid of purchasing RP because this might happen again.
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