Very bad customer service

I placed an order with Catch of the day for 3 items on 10 June 2020. I presumed the items I ordered were all imported goods as I only received confirmation that my order was on its way on 30 June 2020. Now this is all fine as I prepared myself for a wait either way, but when my package eventually arrived on 2 July 2020 there was only one item in the box, and my entire order on the website said it had been "fulfilled". I then wrote to them the same day and questioned this as I only received one item out of a three i ordered. I received a response from one of their customer service agents on the same day telling me the supplier could not deliver the other two items, and could she issue me with a voucher on my account. (Why I had to first ask to be informed of this I do not know). On the same day I said I would prefer a refund as I did not want to have the same thing happen where products just aren't delivered. By 6 July 2020 I had still not received a response to my request and emailed them, and by 9 July 2020 still no reply and I emailed them again. Up to today I have still not received a response and am very unhappy with the service. I would like my refund!