My friend got permanently banned

[2:17] [All] GRVet3ran0sS (Tahm Kench): cnidwef [2:18] GRVet3ran0sS (Tahm Kench): Wfr|?e [2:18] [All] GRVet3ran0sS (Tahm Kench): cWECSwda [2:18] [All] GRVet3ran0sS (Tahm Kench): Fqae [2:18] [All] GRVet3ran0sS (Tahm Kench): fqaes [2:19] [All] GRVet3ran0sS (Tahm Kench): fqawd [2:19] [All] GRVet3ran0sS (Tahm Kench): fcaed [2:19] [All] GRVet3ran0sS (Tahm Kench): "AFWES [2:19] [All] GRVet3ran0sS (Tahm Kench): QWFD [5:02] GRVet3ran0sS (Tahm Kench): poppy 0 gnaks [5:03] GRVet3ran0sS (Tahm Kench): reported [6:21] [All] GRVet3ran0sS (Tahm Kench): open top [6:22] [All] GRVet3ran0sS (Tahm Kench): cya [36:59] [All] GRVet3ran0sS (Tahm Kench): Ez

My friend got banned when we were playing a normal game. At first he got outplayed and his opponent survived with 1 hp and he did that chat spam and called the riven" "FCKN LUCKER" (He was top lane) After that he decided to fool around a bit by saying "poppy 0 ganks reported" when that could never happen since the poppy was support and it was in the 5th minute. Is there anyway I can help him?