Variable shipping charges charged for same product under powership

[onlinegetit]

Each time we ship a product under powership different charges are levied for the same product. In snapdeal the shipping charges are predefined according to the weight of the product and remain fix thoughout the listing. In ebay sometimes they charge 55 sometimes 62 and sometimes 123 for the same product. How can we sell at a fix price when the shipping charges are different every time

[shopatfairprice]

My powership overcharges are pending for over 3 months. The only way to get reimbursement is prepare an excel sheet carrying all these data:

Paisapay ID, Courier, AWB, Actual weight, Charged weight, Charged amount, Supposed to be charged.

I am doing this after each remittance and receiving reimbursements. But patience is the key as it may take months.

And for some particulat items they charge 10 times more even after repeated request. So the only choice is excel sheet again. SAD.