selling defective item and giving runaround regarding collection and refund

I purchased a TV box on the 23 November (Black Friday), which was delivered the very Sunday, and this is impressive right.

Turns out the body thing is defective, so I eventually had to get a friend to come and check it, cause I kept thinking I am doing something wrong, only then he told me, its not even coming on, so I scheduled to return it online. this was over 2 weeks ago when I scheduled a return.

Then I was told it will be picked up before 5pm on Monday, Tuesday the same, I call and email, and receive another sms with your parcel will be picked up by 5 pm today on Wednesday, this went on for the entire week, with me calling, emailing, and getting excuses about their courier company having issues, but it will be done the next day and the next day. By Friday I called again, explaining that I cannot be sitting around all day waiting for this, I need my refund so I can purchase the item somewhere else, I was promised another call etc.

Sunday morning someone comes to collect the item fine, and I continuously get emails about a scheduled collection including this morning , Thursday 20 December, an sms saying someone will come and collect, 4 days after the collection was done, and I am sick of this, as I gave them my money a month ago, I have no working item and refund, and now they keep telling me they will collect when its somewhere in their system or with courier company, now it seems like I will not be getting my money back this year if at all.

This is utter nonsense, I just want my money back so I can get the item somewhere else.