I’ve never bought through Aliexpress so I cannot comment on the support that is offered/not offered. But what I can give is my personal opinion of my experience with the Anker support, which to be honest has been nothing but exemplary. I never expect “red carpet” treatment and compared to other companies I’ve dealt with (not just tech), Anker would be at the top. I’m sure if you spent time reading though the forum you will get a glimpse of others experiences on any issues they have had.
It does seem that you may have gotten a defective speaker, as you said you read the reviews where both the speaker and support got great reviews. So it would be a shame to tarnish the company based on one experience. Now you have raised your concerns and got a response from @AnkerOfficial, I’m confident you will see the support to which we all are so use to.
I’d be interested in a hearing if your opinion changes in the few days / week.