User Activity

I have been trying to pay for an item but the whizkids at ebay will not let me do payment,the seller and myself have spent two days trying to sort it out, ebay as usual no help at all, the seller even cancelled the original sale and relisted but same...
how do I alter negative feedback left for a seller
ebay state they are not sellers or buyers but only supply a platform for transactions, if this is the case how can they legally charge and collect gst, most sellers are not required to charge gst in view of the amount involved. I consider the practic...