Caller blocked by mistake during his call, how to "release" him?

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7

2017-08-05 00:43

Hi,
during call receiving from a friend, by mistake I pushed "block" instead of "answer" button. After that, I could be reached from that number only occasionally ( once in his 10 tries ), although I do not receive note or record for missed calls. Once during the call from that number I noticed on the screen  "spam number calling" ( lasted for a second or two). Pls help.