Poor customer service and faulty products

I recieved bad service from the Trojan gentleman working at game Cresta shopping center as he promised me a refund in a voucher form after inspecting my fault bicycle then the store manager decided they won't give me a refund but book the bicycle in for repairs and I promised me that the bicycle will be fixed by Wednesday but yesterday afternoon I recieved a call from a different manager at the store to inform me that the gentleman can only fix the bicycle today because yesterday he needed to attend a funeral which is a story I don't believe so in short don't buy products there as they will give you more problems that you have the people there including the manager are not properly trained to deal with a customer and basically from what I've experienced do no want to work or go the extra mile for a customer, in short don't buy product from Game cresta shopping center as they are not tested when purchased but when you return the product they need to be examined like you broke the product on purpose.