My burger shop

Hi all is it a secret to get past level 28, I have allot of coins and diamonds, been playing the and fail with missing two customers so sooner are later. You just give up. Can someone look into this. I like playing the game but cant get past certain levels. Also the food is hard to to put on the grill. You are constantly trying to cook the food. Why cant you miss one or two customers and progress to the next level.

Tym*28 about My Burger Shop 2