Originally Posted by
TLVflyer
Anyone have this experience or know how to solve it
Yes, the magic words you need to know are System Issue Form.
Ask the agent to submit a System Issue Form (SIF) together with the mileage request, explaining that you flew in I class, but you paid for a mileage-earning booking class. Note that it takes 6-8 weeks to process an upgraded LH segment after the SIF is submitted.