Bunch of ******

I bought a microwave around about the 12th Sept 2022 and the microwave was delivered on the 16th sept,by the 18th Sept the microwave just stopped working i immediately emailed them,i knew it was a sunday and that they would only replay the monday,they told me the monday that they will collect it from me and they only came the 28th Sept to come and collect it from me, a week later i havent heard anything from them i called and they gave me all different types of stories,i bought myself a new microwave,eventually i got hold of someone and they told me that they are going to send it for repairs,i told them that i fo not want it i want to be credited back the lady whom i spoke to told me that i am still liable for payment on the microwave,i told her that i refused to pay for something that i do not have and i only used it for 1 day,i got the microwave the Friday i used it the saturday and the sunday it stopped working,how can they still hold me liable for the payment of that microwave,after i only used it for 1 day,and i was well within my 14 day policy,i refuse to pay for something i do not have and they didnt even have the decency to call me i had to call after them the whole time,i refuse to pay,can somebody please help me or tell me where i can report them as i know there is a law for us consumers