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The guy you described as doing the same thing over and over and getting nowhere, may have hoped that would give him an idea (but it didn't, need we say.)
The fact is, what you have described is 100% standard-issue hopeless case, I'm sorry to say. The chances of getting your GMail account back are quite slim.
1: did you make any note of your password?
2: do you have any real reason to believe that someone changed your password? e.g. you shared your password, it was simple or just a few words at most, etc. ?