I had a frustrating experience today.

I booked 4 tickets for my family in May for RT mco > slc > mco. I made the "mistake" in picking comfort plus for the slc > mco leg since it was only 5.5k more miles per seat and the 5pm to 11pm flight.

So if I just did main cabin RT it would have been 23k per. It was 28.5k per since one leg was comfort plus. Simple enough.

I complete the purchase pick the seats go to bed. Wake up and the 4 seats on the return flight are just random in the AC. That is weird so I try and put them in comfort plus and I can't pick it.

Called the sky miles number and they told me I bought main cabin only... if I look on the site it shows main cabin for the exact flight is 23k miles and all but two seats are open. I guess I just kicked in to delta an extra 22k miles for fun.

I can cancel and rebook but it takes 7 days to get the miles back. I don't have enough miles to book again until I get them back so who knows what the cost will be in 7 days. My wife and I are booked in the first class cabin on same flight so I really need the family on the same flight.... I can move amex MR points to delta but then they are committed to delta.

I submitted a complaint via delta web site and waiting. Really annoying. i am a silver medallion almost gold.