Faulty product and poor customer service

I recently bought a bicycle on the 1st of May and used it for a week and a half but now the bicycle chain mechanism is faulty and wanted to return the bicycle and get a full refund due to the fact I was sold a product that was not of great quality but the mananger and the gentleman working at Trojan are running the business like its their own and I was refused a full refund and was bluntly told I will not recieved a refund but they will be booking the 2 week old bike in for repairs and they will not be putting in original parts on the bike but something similar but I refuse to accept that so I've escalated the matter with NCC(National Consumers council) even though I've contacted their customer care which was basically me hitting the wall because they have not assisted me with nothing and I'm the one who is doing the follow up, in short don't waste your money at Game cresta shopping center as they will give you the run around and you will have to go the extra mile to get something done, I really regret doing business with them.