Reply on apology thread

I read most of the posts in the thread and don't see how you have done anything wrong. I think a buyer has the right to get a little choked when their parts don't ship and communication stops. I've had this happen to me a couple of times. Fortunately they had happy endings. One one occasion the seller went on vacation for 3 weeks as their Ebay auction closed??????? The seller has the upper hand as they have the money. What can you do?