Builders Warehouse and Digi Tech - substandard product and substandard service

We bought a Digi Tech doorbell that turned out to be defective. (The bell continually rang with now way of switching it off). My husband brought the faulty part (the handset) back to Builders Warehouse in Sunninghill within the stipulated 6 months. He was told that, in order to get a REFUND OR REPLACEMENT, he’d need to bring the entire unit in. I then had to dismantle the unit which had been installed by an electrician, and bring that to them. When I presented myself at the returns office, after a lengthy wait, I was told that the Digi Tech doorbell/ gate release had to be sent to Digi Tech for ‘assessment’ and that it would take 15 to 21 days to get a reply. This was on 3 December 2018. When I questioned this, saying that my husband had been told that the unit would be replaced or refunded when we brought in the full unit, as we were within the 6 month deadline, the manager of the department, NAKEDI, was called. By this stage I’d been there for an hour. A further 20 minutes passed before Nakedi arrived. My husband had insisted that he had been told the unit would be replaced or refunded. I was basically told that he was lying, and when I said that he’s unhappy that we now have to wait ‘15 to 21 days’, Nakedi assured me that ‘it would never be as long as 15 days’ and that she would ‘phone Digi Tech tomorrow ‘ and let us know the outcome. We are now at THIRTY SIX DAYS and STILL WE HAVE HEARD NOTHING FROM EITHER DIGI TECH, NAKEDI OR INDEED ANYBODY AT BULDERS WAREHOUSE. We have spent money on installing this unit, time and money in returning to Builders Warehouse TWICE, removed the defective unit, AND have further spent the entire festive season with no bell and remote gate release. Needless to say, we are now really unhappy and most unimpressed with the false promises and misinformation given by Nakedi and the staff at Builders Warehouse Sunninghill, not to mention poor quality of the Digi Tech product. Beware buyers, Builders Warehouse will lie to you and then not keep the promise they make. Also, don’t buy Digi Tech. It’s substandard in my view and a real mission to install, never mind get refunded or replaced. Shame on you Builders. I’d expect a lot better from the famous Walmart.