I have the same issue... PE to business on LH was successful, but no crediting, and I submitted late December a credit request. It failed so I replied back with my original receipt, and UA Customer Care(?) acknowledged I shall get RDM and will be posted within 2 weeks...

Then nothing happens... I waited 2 weeks and a few days, then I email again a few days ago... nothing happens...

So I shall ask agent to submit SIF as eyal suggested... I will report if it works.
Thanks,