failed deliveries time after time with no contact

I placed an order with a Retail company on the 2 April, not realizing how long lock down would be and that we would have moved. Trying to change the delivery address is ridiculous. Their app is **********, there is a telephone number to contact, a different one each day, one day I get a voice mail of someone coughing, another a guy answers and shouts at me saying he does not work for Aramex any longer. Nobody in customer service answers phones, when they do they say address has been change, yet still not delivered, they say failed delivery, yet I am here. On the email there is a link to arrange delivery time or change, I get an email back to say it is an outgoing address only, and to use another - there is absolutely no response on that one. I am so fed up. All I want to do is delivery address ........