Black Spider Car Audio Disgraceful Service

I purchased the 1st unit: Which was sluggish. Bluetooth did not communicate from device to the unit - it just froze when attempted. Tried Android Auto which mostly did not connect even after setup. Apps did not work properly even after connected. Aux in also did not work. Attempted to contact the manufacturer but to no avail. Naturally placed a negative review on the platform where it was purchased and lo and behold the manufacturer (owner) suddenly contacts me apologizing as he said they had a few faulty units and offered a different unit at the same cost which was supposedly a discount. Also said they had software issues hence did not initially assist. I purchased the 2nd unit and removed the review in good faith: This unit didnt even turn on. I sent a video showing this (all the while paying the installer each time it had to be reconnected...). The sales manager made excuses saying it was incorrectly connected and other incorrect reasons. I was forced to replace the negative review as I once again received bad service. The owner again apologized as he said his sales manager had mistakenly packed a faulty unit and sent it to me! Still trying to be amicable I accepted the 3rd unit: This unit drained my car battery overnight. My installer was flabbergasted. He has installed all my car units for over a decade now. I had to get my car boosted and computer reset as the drain messed with the ecu. It also had marks on the unit where the both usb slots had obviously been used before. I sent a video once again to the owner of this but he insisted that it was new. Finally: I contacted the owner simply requesting a refund as this was about 1 week from receiving this unit. He stated that he would refund but deduct the courier costs of replacing the previous units of R645!