Eden Tech faulty products

I bought a charger cable for my laptop. After a few days, I decided to use the charger, but it burnt. I returned it to the store for a refund, but was advised they cannot give me a refund because it was against company policies. After a heated discussion with the shop assistant, he agreed to order me a proper acer charger. Although we agreed on this I still reported the matter to cresta centre management. I was assisted by a Mr. Kashin/ Kasheen, who immediately went to the store to assist me on resolving the matter. There the shop assistant, Mr Saha agreed to give me the acer charger, free of charge, once received from their supplier. More than a month has passed, I still have not received my charger. When I spoke to Mr Saha about 2 weeks ago he promised that I would get it after that weekend. I sent him a WhatsApp about 4 days ago, but no response from him.