Hello. I have sent the refund of goods to China. China custom asked some bills for this refund, how I can send it? Thanks

How can i get the refund on the package EA927658382CN

My customer was ordered the meterial to make chandelier for sell. Since the product is stuck by coronavirus. It caused her by damage the business and cannot make chandelier for sell to her customer in time.

Please tell me how to proceed the refund??

I need to return wigs back to this company. First they were resisting me a refund trying to give me every excuse under the sun and basically told me I was keeping them. Then after countless emails or repeatedly asking for the return address they only offered a partial refund of which again after me rejecting that as not good enough, then did they send me this address. Can I check if the contact and address is legitimate?
And has anyone else who has sent refund to this address, have you received your refund?

Contact: Shengxu Cai, Phone: 15338770079
Floor6-2B， Jinchi Logistics Park, Xingwei Community, Fuyong Street, Baoan District, Shenzhen City, China, Postal code:518100