Coco kids theme by mikado

So i bought this theme in sept, and ive had 2 experienced programmers tell me there’s an error in the themes code which wont allow a certain customization. I have told the company this and asked for a refund but they are denying any issue. What else can i do? i need to purchase a new theme now to make the changes my website needs!

I have suggested few things. Please, check your PM