Help! If you are experiencing technical problems with your farm, I would first suggest reading through Zynga's support site here. If you are unable to locate an answer to your problem, you can contact Zynga directly.
STEPS
1. Open your farm. Tap the gear button located in the top right corner of the screen, under the People icon.
2. Tap the 'Help' tab, which is in the middle.
3. At the bottom of the screen you will see an 11 digit number, which is your Z-ID. Make note of this to provide to the support team.
4. Tap 'Player Support' located in the middle of the screen. You will be redirected to the Zynga support site.
5. Once the website loads you will notice a red 'Contact Support' button located right in the middle of the page. Click it and complete the 'Contact Support' form, including your Z-ID for reference. Press submit.
That's it! I have contacted Zynga Technical Support once before and someone responded within a day to correct my issue. I was very pleased with their prompt and helpful assistance, and hope your experience is just as positive.
Good luck and happy farming!