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Title Basically. More Info:

My friend got banned today morning and he claims he hasn't cheated or used any scripts that has gotten players banned recently. I can't tell whether he is lying or not, but I wanted to get both perspectives.
Another question: Is it possible to go Platinum 1 to Diamond 3 overnight, when you have been stuck in Platinum for a whole month? The reason is that, this is exactly what happened to my friend + he has cheated in other games before (Apex, Fortnite).

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over 4 years ago - /u/RiotArkem - Direct link

We've banned innocent people before but it's very rare. When we do we're quick to fix the situation (often before the player realizes they were banned).

We take false positives really seriously, if we see a cheat detection strategy generate a false positive we will take it out of commission immediately while we fix it.

For your friend I'd assume they were cheating, it's more likely than a false positive especially given the unusual amount of rank increase there.