Optimize Amazon Catalog Product Listings

We are seeking a long term Amazon Listing Specialist:

MUST have DEMONSTRATED PREVIOUS proven experience with fixing Amazon Listings where your client (US) is NOT the brand but a authorized third party seller
MUST be English Speaking (VERY Fluent in both Writing as well as Communication)

We need assistance in fixing issues within our existing Amazon product catalog. The catalog contains over 6700 products, and we are faced with issues, mostly caused by previous Amazon sellers problems, such as incorrect product descriptions, misplaced products in wrong categories, and mismatched product identifiers or SKUs that Amazon says exist within our catalog but actually dont.

We are looking for someone with PROVEN EXPERIENCE in dealing with Amazon Customer Service DIRECTLY to get Amazon product listings correct. (We have all the authorized and correct titles, SKUs and UPCs). Ideally, you should have expertise in Amazon Seller Central and a keen eye for detail to ensure the listings are accurate and comply with Amazon's standards. Should have experience with Microsoft Excel.
Preference given to candidates who understand lingo involved within the fishing tackle industry

Please share your approach and experience in handling similar catalog issues.