Ecom Express - Fake Weight Discrepancy given by the ecom express many times

I am a ecommerce seller who sells through amazon and i was shipping my parcels using Ecom Express. my all parcels dimensions are **x**x*cm and weights hardly *** grams, but still i pay for the parcel upto *** grams, but suddenly after few days of shipping the parcel the ecom express puts an fake weight discrepancy on that and and charges me for * kg parcel which is twice the amount i pay for ***gm. i have all the proofs of my parcels (photos, also i can show you my amazon product listing you can match it from there). There is no way to contact ecom express, their official number available in public forums is switched off, i have mailed them **s of times no reply, but in linkedin sometimes they reply and all they say is we are looking to solve your issue, but even after a month nothing has been solved, and i have to keep paying them extra money for the courier. please voxya solve this issue as soon as possible.