Thanks everyone for chiming in. Sorry for the long read in the first post. I wanted to provide all the details, not just screaming around how Delta support was terrible with no grounds for that.
Originally Posted by
hotturnip
You'll find a lot of "blame the victim" around here.
Yeah, sure I did. First of all, I'm pleased to hear it's all about me and other Diamond members do get so much better support from Diamond line. It gives me a hope one day I'll be among them

.
Still, my message had basically 3 points. Being a Diamond member ticketed in business class facing IRROPS:
1. It's not okay to spend 4 hours on a Diamond line with 5 different agents with
no results (and with 1 agents out of 5 actually offering a single option for rebooking when there were multiple easily available) being fed with complete BS - major point
2. Yes, it's not by the books, but I do expect some special treatment from DL when DL is the one who ruined all my travel plans (it's about me asking at DTW to be rebooked on the next morning flight)
3. It's not okay to be waiting
any response from Customer Care for 3 weeks
Well... and I don't really get why my itinerary was deemed complicated and so on. Delta is an international airline which operates on hundreds of international markets. I had 006 ticket with clear fare basis to begin with. Then, all above doesn't really matter, coz it was IRROPS, so how comes they were going to rebook me in economy and waitlist with GUC and so on and so on? In case of IRROPS Air France, KLM, Lufthansa, SAS, Thai, Aeroflot, British Airways (from what I can recall from my personal experience) just rebooked me on the next available option in the ticketed cabin no matter was it revenue or award ticket. It has never been an issue, even on airlines outside their direct partners. With Delta Diamond line apparently it
was an issue - even rebooking on a joint venture partners. That's just nonsense and that's absolutely not okay for a Diamond line to provide such level of support.