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Hey there Tracy, welcome and Im sorry to hear that. Are you getting any error messages when you're trying to buy something? It helps if you have a screenshot as well so we can see what's happening!
Otherwise it's great if you can tell us what device and platform (Android, iOS etc) you're playing on, as well as your Player ID!
For your problem I'd recommend checking that you have a stable internet connection, and I would also restart the device and make sure that besides the game, that you don't have any updates for the device it self as well.
I've done everything you suggested and still nothing I'm on a Samsung tab a. Everything is OK then after the 1 tap buy I get a blank as in the pic. Thank you