These days the most frequent way to communicate with a company is via e-mail. It is usually fast and to the point. So, it is quite frustrating when a company doesn't respond.
A good example is Mastey de Paris, they rarely, if ever, respond to e-mails. A recent e-mail was sent to them inquiring when their skin care line would again be available, specifically regarding Mastey Moiste Facial Moisturizer. No response. E-mail should be answered promptly, especially when there is so much competition for consumer interest.
An e-mail was sent to Alterna regarding a product they offer requesting further information. Again, no response. This e-mail was sent to them seeking information on how to use a product as a potential new customer and they didn't make the effort to respond.
Have you had similar difficulty get an e-mail answered? Did it deter you from doing business with them?