I am looking for very experienced Amazon specialist as my assistant to resolve non standard issues with my listings

For example now I see that some of the listings not appearing, some of these in variations shows wrong ASIN when I pick up exactly color or size . So the ASN doesn’t change when I switch the product in variation. I have as well problems with bar code scanning that worked well before. But now something happens and some of my products when I scanned doesn’t show in Amazon catalog ( previously yes, scanned and showed). Some of my listings are active but I don’t see this listing when I go to my Amazon store . The correspondence with support take a lot of times and don’t give me a result in most cases because they are not really interested to help and fixed problems