Seller not honoring advertised price

Question

I attempted to purchase an item that comes in different sizes. The seller was advertising a specific size for a specific price. When I attempted to make the purchase the cost of the size being advertised increased. I contacted the seller but am not receiving a response that indicates the seller understands the issue. I cannot locate an eBay policy on honoring advertised prices. Any assistance with understanding whether the seller has to honor the price is much appreciated.

rfmtm · Answer

Are you sure that different sizes aren't different prices? What is the Item Number?