There is a direct 800 phone number that I have been using for years. The IVR used to say something about welcome to the PremEx MP Service Center, so it may only be available to 1P and above. I'm not going to list it here, but if you are 1P or above, I suggest calling reservations and asking them for it.
In any case, I've never had an issue with getting credit from *A partners, so I count myself as lucky. 30% missing credit is hard to believe. Your issue with your first name seems to be an issue you've brought upon yourself so I can't have too much sympathy for you there. I might suggest if you are looking to credit a partner flight to UA, you remember to match the name to your MP profile.
Service is better as a 1k, but based on your rant below, I'm guessing won't meet your expectations.