Too many bugs

I’m unable to upgrade plants when I try, coins come up. It’s the same if I try and purchase energy. Most of my plants are waiting for upgrades so it’s frustrating as I have the required coins to upgrade, but they won’t. I’ve only just got the forum working as I kept getting error 500. I’ve deleted and reinstalled the game at least 5 times, but the problems still exist. I no longer get much pleasure from playing Plants v Zombies 2 as I’m not getting the rewards. I’m using IOS to play the game.