I do not understand why you need to contact this seller! All problems are dealt with through cases which go through ebay and if seller ignores a case then you escalate to ebay,which can haveexpensive consequences for the seller.
Sellers can ignore other members, but they cannot ignore ebay and can risk suspension if they don't deal with a buyers problem.
It would help if you explained the problem better, as unless you deal with a problem using correct method you can run out of time.
