All my play data has gone!!

Same here. Gems gone 0 from 5K++. The coins shows infinite numbers but when trying to upgrade a plant costing 3000 coins only, won't proceed. 

Hey beeorchidd​ , did you previously link your progress to an account ? If you are having issues remembering your credentials you might want to get in touch with our help support so they can take a look and help you recovering your logins: https://help.ea.com/en/customer-care/