Lack of quality product and customer care

I have always bought many lights and ceiling fans there. Recently I purchased some low voltage LED spotlights for ceiling mount with a transformer and 2 carrier wires. The individual lights keep blowing, I already had to buy a new set, but after a few months these also blow. None of my other lights in the house have a problem. Clearly an inferior product that I wish to raise with the manufacturer. The Alberton shop where I bought them referred me to Hein from HQ, but Hein never answers his phone nor returns calls. Clearly this company does not care about customers.