[ReneG]

Don't return 1 on OnPlayerText. Return 0 to get rid of the normal SA:MP chat.

pawn Код:

public OnPlayerText(playerid, text[])
{
    new pname[MAX_PLAYER_NAME], str[128];
    GetPlayerName(playerid, pname, sizeof(pname));
    format(str, sizeof(str), "%s says: %s", pname, text);
    return 0;
}

You also need to look up a ProxDetector function so it sends the message to only those who are near.