Soooooo...
I’ve actually been banned from the game, but after installing it again, I’ve found a way to keep it working just fine lol
Here’s the thing: zahir already told us the developers of the game made it harder to hack, that's why the former diamond system doesn't work anymore (the one where we stored diamonds when picking a diamond choice)
If you are already playing and has like 10k diamonds, DO NOT buy a card! Seriously! Just buy a card when you REALLY need it (like when you’re out of diamonds at all!) because if you buy a card when you already have tons of diamonds, the system will mark you as a bot or a hack and ban you. Another thing: only buy ONE card at the time! Just one is enough (you’ll get like 50k diamonds), tap ONCE in the card, so you can buy it and play the game with the diamonds you get. The tip here is to not be greedy