Multiple Summoner Spells with 0 CD [Gameplay]

I was just in a game as Mordekaiser and laning against a Gangplank. According to the loading screen his summoner spells were Ignite and Flash. In game, however anytime he was killed or pushed to behind the tower and had to back he could just instantly return to lane a half second later by teleporting to a random place. I say a random location in the lane because NONE of the places he was teleporting to had a minion or vision or even trinket there. When I expressed concern in the game in both the all chat and to just my team, they all ignored it or didn't believe me until they witnessed it as well. This is really annoying, he didn't build anything related to cooldown in game till Frozen Heart near the end of the game and in-game items don't affect summoner spells. So how could he be spamming summoner spells and using ones that weren't indicated? Is this the new "bot players" issue for the year? This is really starting to get ridiculous. RITO I know you're out for the money, but stop letting honest playing fans of the game suffer because people just want to cheat their way to the top. Here is a link to the game that was played, along with the summoner that played Gangplank. Yeah my team lost the match, and no it wasn't because of GP specifically that we lost.....so its not just some butthurt loser that wants to start shit. This is a serious problem, how many more people have been in lane and wondering why their enemy has 3 or more summoner spells, or for that matter skills in their champion's kit, that can just be spammed against them without any way to report or rectify the issue?