I once did an internship at an ISP’s support department, and have first hand knowldge that some customers can be annoying, but this is also true for some support teams, they can be very annoying too.
Note: It is almost a rant, beware if you want to read ahead:
Recently I had to buy a wordpress theme but the website only supported Paypal to Paypal transactions, and as Paypal is not available in Pakistan I contacted the company, told them that it is not available in my reigon and I can pay by credit card if they can accept it direrctly or have some other mode of payment. They replied after a day (which makes me believe that it was not an automated reply), and after thanking me for my email & visiting their site, told me:
If you want to pay by credit card, you need to create a PayPal account then link your credit card to your paypal account.
This followed by telling me how to link my credit card with Paypal, then couple of paragraphs explaining the benifits of Paypal, without saying anything specific to my query.
I am not posting this to complain about one specific company, I have experienced such support responses before. In general I don’t care if any company does or does not provide some specific service, for most things there is enough competition that if one doesn’t like a provider they can choose another. In the above situation, I would have been happier if they had just sent a simple email saying "No, we only support Paypal for payments", but what really annoys me is when people don’t read the emails before replying.
So, this is just my way of saying, if you really care about customers, please read what they are asking before replying. A short, to the point answer is much better than a long, unrelated answer.