ask (by letter) blaser if they are gonna correct the situation or not. if there tech staff gives up suggest that it goes to a gunsmith that you trust, and they pick up the bill. if they cant fix the gun then a refund is in order.
if they wont refund either do the lawer thing or take it to your gunsmith and have it fixed.

it sounds like the ejector rim needs a trimming but without the gun it is anybodys guess.

imho get in tuch with blaser germany and tell them that this situation is being discussed on NE.com and AR:COM and else where.

regards peter