Caller blocked by mistake

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http://forum.xda-developers.com – Hello I have annoying problem. I use GO Dialer and GO Contacts EX. Call receiving screen looks like stock. I had a call from friend, he wasn't saved in contacts yet. When he was calling and i went to pick the call i think i pressed something because question popup saying something like "Do you want to block something? Yes/No". I think i pressed "No" but now my friend can't call me. Phone does not respond, like no call is being done, only for that one number. Also i don't have him in my calls history. Is this known issue? Any solutions? Thanks. (HowTos)