User Activity

The seller advertised $5.49 for the first item & $1.49 but it hasn't turned up that way on the invoice. I've sent the seller multiple messages regarding the issue but have seen no change or received a response. What can or do I do? It's been almost 2...
The seller advertised $5.49 for the first item & $1.49 but it hasn't turned up that way on the invoice. I've sent the seller multiple messages regarding the issue but have seen no change or received a response. What can or do I do?