Postage dispute

[dmh160161]

I recently bid on and won a bulk listing of 3 items with postage stated as $8.25, I have paid in full, but now seller tells me that she thought the items would fit in 500g bag but she had to use a 3kg and wants me to pay the extra cost.  Not sure if I should just pay the extra and not make waves or refuse to pay, as seller needs to learn to correctly list postage costs, or wear the difference.  She can't refuse to send item if I don't pay extra.  What would you do, as I am in two minds?  

[harley_babes_hoard · Accepted solution]

It's their mistake. sellers are not allowed to increase postage UNLESS you request and extra option like register or express etc. If they don't send the item just open up a paypal (i assumed you paid this way) item not received dispute and you will get your money back.