Valid Tracking Rate Shadowfax

Amazon told me that change your courier partner, which is Shadowfax, my all orders show sent as order status, but my valid tracking rate just fall from 96% to 70%.They have a problem with their system now blaming the customer I also talk to customer service they said that this is not our fault this is your fault, they have tie upped

with EcomExpress, customer won't tell then change courier service, this is disgusting. My case id :9486479842