Builders Warehouse Customer(don't)care

I checked online and they said that they had stock of an invertor that I wanted to purchase at a branch, just for me to drive out to the branch and hear there is no stock available. Ordered it online and paid fore it were it said there is a waiting period, over a month later and I had to follow up with them and they could not tell me when I would receive it. After a whole lot of back and forth it finally arrived. After some time the unite started packing up and I was still in my warranty period. They wanted me to wait for 21 days until the supplier had a look at it and then decide if I can get a refund or a replacement. I think it is a super ****ty practice to keep your clients waiting for an order without updating them that it will be late, and not being able to inform you when you can expect delivery after it is already late. It is also very stupid to make a customer wait 21 days for you and your supplier to figure out if the unit is indeed broken and he can get a refund or a replacement. I would not recommend Builders Warehouse at all.