Today on Payday 2's community hub on Steam, producer Almir Listo penned the following:
The past few weeks have been some of the most challenging in the history of this community. Players have been angry with us, media have written about us en masse and our volunteer moderators went on strike. For all the distress we've caused the past few weeks, I'd just like to take the time and say that we’re sorry. We've done a lot of things right in the past, but these past few weeks we screwed up. We need to get better at many things, and we will do our best to improve as soon as possible.
The post goes on to mention a "proof-of-concept tournament" the developer will be hosting at various DreamHack LAN events, before finishing with some action points regarding the recent MT debacle -- the two major ones being Listo's plans to meet with a few of the volunteer moderators and the fact that Overkill developers will take a more active role on the game's forums.
There's also link to a two-hour video discussion between Listo and three of the community's volunteer moderators which provides some insight into Overkill's thinking with Completely Overkill:
... we all agreed that [it] sounded like a great idea. However, fast forward to now, we'd probably never do it again ... we're never going to do a Completely Overkill pack again, like the way it was introduced. It's bad practice, we have learned, to tell players that you'll get something secret down the line. We can't possibly make those people happy.
As for refunds -- they're "not an option [the developer is] discussing", however, it is tossing around other ideas for compensation, such as safes with guaranteed mint condition drops. The full conversation is available below, but it's quite a slog to get through.