Bestdrive Hartbee****rt

I have purchased a battery from Bestdrive in Hartbee****rt for VW Jetta. After I replaced the purchased battery there was error messages on my vehicle screen display of certain functions not working. I phoned a VW dealer to find out why the error messages, and they said to me i have to bring the vehicle in for them to do a diagnostics of the vehicle. I drove to the dealer, but 30 min into my journey the battery completely failed and all electronics was not working, and I was stranded. The vehicle had to be collected by truck to take it to VW Dealer. They tested the battery and the battery was faulty and did not work. I replace the battery again with an VW original battery and the vehicle was working correctly. When I returned the battery to Bestdrive Hartbee****rt, they tested it and the reading was 6volts, clearly showing it is faulty. The person who helped me Bismark refuses to refund my money, and is trying to look for excuses not to refund me my money. Just a warning to everyone who wants to use them, my experience was that they are not honest and is deceitful