Pay back my deposit I paid for the 5g router

I ordered a 5g router, when I checked if there's network in my area, the site said I had. I received the router beginning of May and 2 days after trying endlessly to get connectivity I tried to call and due to lockdown call center was closed. I then sent an email which was only responded ro 3 weeks later and all they were concerned about was how they can take delivery of the router no one cared about my frustration and also the refund I requested for no one even acknowledged my request to have it refunded. After back and forth and eventually some measly explanation the router was collected and I was promised it was gonna be tested and I would be refunded. Suddenly nothing is happening and the person who was assisting me and promised to come back to me is no longer responding. That is ***. I am very disappointed with the service received. Please pay back my money as I never used any internet and I cooled off immediately when I realised the router wasn't connecting.