To all: Thanks for help and tips.

The frame is a Bianchi Sempre (2011). I think Bianchi had a 5 year warranty on frames (so 1 year late).

I have checked with a carbon repair shop, and it will cost too much (550 usd for fixing the carbon if i replace the alloy insert.

I have sent pictures to Bianchi as well to see what they can do.