cancelled without confirmation and zero refund given

I ordered a 5G device, took forever for it to start working and when it did it was terrible, it did get better after some time, so i decided to give it a try instead of cancelling, a month goes by i recieve a text message saying it has been cancelled after i did not confirm any cancellation (it was fine, planned on just ordering a new one) they get in contact with me very fast asking for the address for the collection of the device, i ask them what about my refund? they said it would be processed after the device is delivered back to them.... and you guessed it, device has been delivered to them and they have gone quiet, i am now sending daily emails and calls just for the emails to be ignored and calls to be fowarded to the next person and to the next person ect, will i get my refund? will rain pull up their socks? stay tuned for the next episode of "terrible customer service"