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why has it gone?
Generally players lose FC by accidental clicks when their farm is lagging. Below your farm there is a button labelled Recent Farm Cash Transactions, click that and it shows the last 3 or 4 purchases. Check the FC transactions if you did not intend to make those purchases contact Customer Service see if they can reverse the transactions.
There is a Support tab at the top of your farm, click that and at the bottom of the list that opens there should be a red Contact Us button. If there is no Contact Us button you can also use one of the following links and the red Contact Us button at the upper right or Submit button at the bottom.
Please try the tab on your farm first as it will pre-fill many of the questions on the form. Good luck!