Absolutely no after sales service.

Order #***. I am very disappointed in OneDayOnly's after sales service. I bought a Panasonic Inverter Genius 44L Microwave (NN-ST780SVPQ) on 11 March 2020 and received the microwave on 17 March 2020. This microwave broke on 16 July 2020 due to a manufacturing fault, not anything I have done. I have e-mailed OneDayOnly many times to come and collect the microwave as it is still under the 1 year warranty and guarantee. OneDayOnly does not have any telephone number to contact them on and I receive absolutely no replies from them via e-mail. The ticket numbers for the e-mails are: #935369 #938150 I have contacted Panasonic too who said that OneDayOnly must book in this microwave with them to be replaced. So the message I am getting from OneDayOnly is that if you buy an item from them, and it breaks whilst still under warranty and guarantee, you will not receive any after sales assistance from them. Please tell me what I must do now? Accept that my new broken microwave won't be replaced? Must I take legal action against OneDayOnly? What must I do to get any service from you, to come and collect this microwave and give me a new one?