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It's a computer. All kinds of stuff happens with computers at times especially when some big enough action is being undertaken. Not great, but reality of computing and has been for decades.
 
My Windows computer froze today so based on the OP's logic I will declare all PC's the World over are a joke. I missed millions of Skype calls and couldn't read joke threads. What an inconvenience. No offence intended :)
 
I've forgotten what I ate yesterday morning. Human brain is a joke!!!!!!
 
I made a really big decision today - to erase all content and settings

So, i pressed the button, my screen turned into a rotating sign
i waited 4 hours ,missed hundreds of calls from my family my friend, etc.
i went to my friend's place for dinner, when i came back home, another 5 hours has gone by
i looked at my phone, that sign was still spinning,
so i forced it to reboot by pressing power and home together.

what i saw after 9 hours waiting was nothing changed, not even a photo was deleted

WTF? APPLE? what the ***** does this option actually do?

I can tell you right now, the iPhone isn't a joke at all.
 
Assuming "hundreds of calls" is actually on the low end of 200, and not more, over a period 240 minutes this would result in a call every 1 minute and 12 seconds.

Either there is some gross exaggeration on the part of the OP or there is some severe relational dysfunction. Assuming the OP is an honest and straightforward individual I feel there is the responsibility here to inform you to seek professional medical assistance.
 
I made a really big decision today - to erase all content and settings

So, i pressed the button, my screen turned into a rotating sign
i waited 4 hours ,missed hundreds of calls from my family my friend, etc.
i went to my friend's place for dinner, when i came back home, another 5 hours has gone by
i looked at my phone, that sign was still spinning,
so i forced it to reboot by pressing power and home together.

what i saw after 9 hours waiting was nothing changed, not even a photo was deleted

WTF? APPLE? what the ***** does this option actually do?

Was your iPhone nail roken when you tried to restore it?
 
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