If you do what you suggest, Ebay will acknowledge your complaint but you won't know what action, if any, they take.
You will also have to go to the bother of opening a return case and returning the items in order to get a refund.
If you bought from a UK business seller, you could report the seller to Trading Standards but they won't act on a single complaint.
Personally, I would just take my business to another seller.
"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)