I'm probably going to get shot down for this one - how about the somewhat old fashioned art of letter writing?
A lot (most?) contact centres are now home-working. Letters will be going to the office with no one there. It’ll be a slow response.
Even at best, letters are a slower response. As there are so few they aren’t usually recorded or put into the statistics, so you can usually put what you want in a letter (promise the customer the earth, tell them what they want to hear) as no one monitors letters, but phone calls are recorded and listened to and emails are read to check responses are correct.
Many contact centre staff are either on minimum wage (minimum wage equals minimum attitude) or on performance pay, which is often excellent money, but you have to hit targets, not just volume but quality.
We, for example, when on emails, had to answer at least 25 emails an hour, of which a random 33% were checked. These had to score at least 98% on quality checks when monitored. We were also not allowed more than two further emails back from the customer in the chain, as this meant we hadn’t answered the original points if they came back to us.
On phone lines, we had to have an AHT (average handling time) below 3 and a half minutes. So if one call took four minutes, another one needed to be three! Again at least 33% monitored, and a quality score of at least 98%.
When short staffed (or busy), phones are the first thing to go. Live chat is faster as we each had upto five chats live at any one time, you can only be on one phone call at a time!
It is possible to work from home on the phones, but much easier to do emails and live chat only. Hence why phone lines have either long queues or are currently closed.
You always, of course, get people who insist on speaking to a manager as if this will get them something else. All it gets them is an annoyed manager of course. This is much more of an issue when home working, you can’t stroll over to the mangers desk and ask them. You can forward them an email, or screenshot and message a live chat.