Amazon

Amazon allows so many people to either buy, sell, or rent a variety of things ranging from books to electronics to clothes. Basically, Amazon maintains a high demand because they want to meet the needs of every potential customer. There are a few kinks that they have to work out with electronic orders such as ebook, apps, etc. If you buy a tangible good from amazon, the return/refund process is easy, but let's say you accidently buy an ebook on the wrong card and want to switch the billed card or simply return/refund it. You actually have to call them and have them refund the book as oppose to clicking the refund button like you would if it was a regular book. In conclusion, as Amazon progresses in the marketing area to meet the ideals of every customer, it wouldn't hinder them to advance in their customer service as well.