There is no need to contact Ebay. What do you want them to do?
Buyers do agree to purchase items and then change their minds. I just find it best to accept a cancellation.
There are no fees for selling. If you use optional features like a subtitle, have a reserve or promote your listing, you will pay those charges whether or not your item sells.
Finally, you are not allowed to ask for cash on collection. Buyers have to pay through Ebay and then, once they have paid, you can exchange details and arrange collection.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)