Hey RIOT !!! can you help me ???

I have PBE acc and somebody have my username and password , and always buy champions , skins , wards , icons , ... AND CHANGE NAME 2-3 TIMES IN ROW , and when i log in , i see that changed name , i change it to my and see in play history champions that i was never play ... i was conctated Player Support and they dont help me , PLS RIOT DO ANYTHING !!!!
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