This is not the case though, pieces that fail audits don’t get repaired. Your node likely just got more data so the missing pieces represent a smaller percentage of total pieces.
There are though, it’s called erasure coding. They just aren’t stored on your node. 
Well I know they keep an eye on suggestions, especially those with lots of votes. So best way to get their attention is to just vote on the corresponding suggestion here: Tuning audit scoring