Setting a Standard..
When you set a standard people tend to follow it.
If a company sets a standard that their only communication tool is an Email, trust me you have no option but to adapt.
There are companies that don't even have WhatsApp Number or Phone number, just send a mail.
This applies to system, when you build a system flow chart, without little or much human effort people follow through.
If you set your communication preference to be WhatsApp, people will WhatsApp you.
If you set it to Phone call, na call them go use,
If you set it to Telegram, they will,
If you set it to messenger alone (meanwhile there is a way to generate Messenger link),
If you set email, that's what it will be.
There are people not on Facebook, not On Instagram but Twitter and the vice versa.
Set the standard, people follow.