Wish complaint: Faulty battery in N-Book.

I ordered by mistake 4 N-books from Wish, I tried to cancel my order as soon as I realised my mistake which was only about 5minutes but I was told by message that my order had been proceed and was on it’s way. When I received the order I tried to return 3Nbook computers to Wish, I took the parcel to the post office paid for postage even though I was assure that posted had already been prepaid by Wish. I had the parcel RETURNED to me because Wish had only made provision for the return of one N-Book even though I had specified in my e-mail I wanted to return 3 items.
I tried again to return and get a credit on 3 N-books only to have them returned because customs wouldn’t clear it through customs because the N-Books contained Lithium batteries.
I can’t use the N-Book that I kept because the battery has had a meltdown and has melted the casing of the N-Book. I want to return ALL THE N-BOOKS and get a refund.
I would like to SPEAK TO SOMEONE and sort this out because it has cost me over $800 and I can’t use the N-books because they are dangerous.
Your sincerely Annie Walsh.