Need to see if I am right? 
I won an action (4 cushions) last week. Seller has just asked me to pay extra (for postage) as she weighed them incorrectly.
It an extra 3.50. I don't think I should, and that she should just swallow the cost (as I have done numerous times)
For the sake of 3.50, I think its rather silly to bother me. The cushions went for a low price, and I think she might be fed up about that?
I don't think its very professional. Apparently she will understand if I choose to cancel?
Am I being unreasonable though?