my account banned for no reason

i literally did nothing wrong and i got banned with no warning, i finished a game up and then i left my computer to go walk my dog and then i come back to see this message

my ign is "ur aii weenies" i think you may have banned the wrong person, and it said to check my email so i checked my email and i got no email about this ban, i tried verifying my email to ANOTHER email and still got no email, i would like an explanation about this ban riot

i did not afk, i do not verbally abuse people in chat, i do not feed, i need to know why i was banned, maybe you banned the wrong person

please fix it asap thanks