Rainbow effect on tempered glass?

So I got the tempered glass thing for my iPhone that is supposed to be shatter proof and they even said there will be no rainbow effect but guess what. It has the rainbow effect right smack in the middle of my screen and I freaking cracked! And they won't fix it unless I pay $20 and i'm not about to pay them for their own mistake after paying $50 for I and they installed I for me. Does anyone know how to fix this rainbow effect?

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