Q: Can't merge two apple IDs and can't download purchases from both onto the same iMac

Some time ago I discovered that I had inadvertently created two apple IDs. One that I had used many years ago as a student and then the other I created when I bought my first iPhone. These days I only use the newer account I created however I still own a few songs which were purchased on the older account back when I was a student. SO recently I logged into the older account to get those old songs that I'd purchased and download them onto my work iMac - GREAT! ...Right up until I wanted to now download some newer songs I'd recently purchased directly onto my iPhone using the new account - UH-OH! NOPE! I'm not allowed to download those songs for 90 days! Are you frickin kidding me?! They're both MY accounts! They're both linked to me - use the same details, same address, same credit card, same everything else!!! But apple won't let me download songs that I now own for 3 months onto my iMac because I happen to have two accounts. This is insanely ridiculous! I would happilly merge the two accounts if it was possible but of course there is no way to do this either. I understand that the intention is to stop people from sharing songs by linking to a friends apple ID and downloading their songs, however I am in no way trying to do this. I just want to have access to all the songs that I own on all my machines. I want to listen to songs that I have legitimately purchased on my work machine as well as on my iPhone, my iPad and my home iMac. Surely this is not too much to ask? C'mon apple!! Can't you find a way to either link/merge my two accounts or to verify that they both belong to the same person so I don't run into this problem? I don't think I should have to wait 3 months to get access to songs I have purchased!