i had the same experience with Marie West and am blocked by her under 2 accounts. First time I missed a call. Tried again and it took a very long time to answer. Then there was dead air and she hung up. I tried again and she went offline rather than take my call. Then blocked me. I also got the impression she may be 'looking into' me or something.
I never leave feedback. Well, very, very rarely. I had one reader -- Samantha Wild, who also blocked me before even speaking to me, send me a keen email to say that she only takes callers who leave feedback (positive, I'm assuming). Maybe that's why? A mystery, but I try to think "oh well, one less person I can read with is not a bad thing..."