Gardenia leafs and buds are going down

[bazz007]

Hi,

I recently purchased a gardenia from Bunnings, and it was healthy when I bought it. However, over time, its leaves have started to droop, and the buds are also wilting. Some of the leaves have small

 

 

   

 

 

holes, and others are shrinking. What could be causing these issues, and how can I treat them?

I would appreciate any help.