Hi, I've noticed a terrible, annoying creaking noise from the bottom bracket. Can you give me some advice?

in the description in large letters it was indicated that customs was included in the transport costs in EU countries, complete with photos and logos, when the frame arrived I had to pay almost the same amount paid for the frame, obviously the seller took off from any responsibility because as in all non-transparent contracts it was indicated that if you use the Aliexpress courier you are at your expense, the thing that left me speechless is that Aliexpress didn't even comment on my complaints and calmly rejected my refund request , the seller strangely modified the pages by removing images and references to the fact that customs costs were not paid, so let's say that seriousness is not part of this system

I used only parts that came with frame/handlebars.
The used fork I bought had an expandable nut in it and it was same thread as the handlebar cover bolt so I simply did the adjustment per regular procedure

Thank you for the explanation

Hi, I'm writing from Italy. I have a Yoeleo G21 frame which I don't mind. Now I've decided to build myself a mtb and I bought a Spcycle. Looking for info, I discovered this interesting context of the world. I thank you and I hope that a constructive exchange can arise.