i got a miscall 7 month ago from unknow number and i deleted it .now it seem important to me .so, can i get it back?? please please help

I don't think you're going to get any different response no matter how many times you post this question. What you're asking is impossible, and in any case, if it was a call from an unknown number there's nothing to "get back". You can't find out what the number was and you wouldn't be able to return the call.