How and where to report Yougov survey site?

I was too receive my payment in 5 weeks but I didn't receive it. Plus, the customer care lady is rude and is not providing a solution. She isn't forwarding or contacting her seniors regarding this and literally said go to h**l I don't care, go report to whoever you want.

So basically, how to report Yougov for this incident for non-payment and not providing what they had promised?