Avantree Audition Pro

My order arrives with deep hissing noise and some random distortions at left side. Box seal was opened also, probably they sent me a refused product by previous customer. After several attempts to fix and factory reset according instructions in manual book, opened a trouble ticket on official avantree web site. They ridiculously responded with automated messages just like copy-paste from user's manual.

Started dispute for refund on Aliexpress and it is under process. Because of noise problems impossible to prove, I have to pay for shipping cost for refund and tax payment at custom has already burned. I don't know what Aliexpress will decide when it may be possible excalation.

I observed other purchases on comment section on Aliexpress, I guess I am unlucky but becareful about Avantree products anyway...