Slow ban ?

So around 2 years ago i used a third-party program called MK lol wich allowd you to use any skins in the game and it would also record gameplay for you (wich i used more then the skins feature beacuse lol replay rarily worked) and i used it maybe 1-2 weeks then i deletet it and 2 weeks after i deleted it i recived a warning from riot saying if i keep using it i will get banned, I told them that i was sorry and that i wouldn't use it again (wich i didn't). So now 2 years later after have spent a lot of time and Money (300-400 dollars) into it, I now got banned and as you could imagen i was supprised i asked them why i was banned and they told my that i got banned for cheating, I told them that i just changed my password beacuse my Little brother saw that someone had played Vi on my account, And then they told my that i was banned for account shareing wich made no sense to say after they had already told my that i was banned for cheating. So i told them that my Little brother played sometimes on my account since i took a break from playing and i didn't want my account to get deletet for being innactive. And then thay told me again that i was banned for account sharing and that someone was using cheats. And as the conversation whent on they kept changing from cheats to account sharing. And with no information on what type of cheats i used before i got banned and that i stopped getting replies after sending that warning (wich they said that they didn't give out) i strongly belive that i got banned for something i did 2 years ago. So that warning i got meant nothing and it also had mor information on it than the bans does. Pleas unban me