IPhone deleted contacts and calendar?

I went on my iPhone at 9:30 this morning and everything was fine, however when I came back to it 2 hours later it had randomly deleted a load of my contacts and my calendar!

Please please help me I need to know if there's a way of getting these back and why my phone has done this in the first place!

If you backed it up you can hook up to iTunes on computer

Check what account you are signed into iCloud with as I too have accidently signed into a different account and lots contacts.

If you are logged into the wrong account, just log into the correct one and you will get your contacts back if you backed up.

I'd go with Tom you are logged in a different account that's why you noticed a sudden loss of contacts as it will never just happen randomly or, you might've updated your phone to the ios 7 in that case you can check alot of problems and solutions reported in the below links
http://wizdroid.blogspot.com/2013/11/iOS-7-Problems.html
http://wizdroid.blogspot.com/2013/11/ios-7-problems-p2.html
http://wizdroid.blogspot.com/2013/12/ios-7-problems-final.html

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