On a whim, I tried calling MP to see if I could get my February LX flights credited. Lo and behold the agent did it while I was on the phone! I had to give her my ticket number, flights and booking codes, but she did it. However she could only do the outbound since it hasn't yet been 15 days since my return LX flights. So I'll have to call back in a couple days to get those credited.
Also, she said it would take up to 15 days to show up in my account online.
But still this is progress, eh?