Amazon Shipments reconciliation, and other reimbursement cases

Hi
We are an online amazon company, looking for someone with knowledge in seller central, with past experience on the tasks below.
1) Reconcile FBA shipments, find discrepancies and shortcomings and open cases for reimbursement.
2) open up cases for RMA and ask for reimbursement.
3) open up cases for lost or damaged FBA inventory and ask for reimbursement.
4) open up cases for wrong FBA fees on items and ask for reimbursement.

Please write back with your past experience in the above.

Thanks