Atrocious customer service

Despite offering email on their website, and despite the staff being capable of forwarding impersonal notices, I have struggled for four years to get them to stick to email communication. I keep insisting on email communication, and they keep phoning me. I do not think that a venture incapable of dealing with a rudimentary administration task such as keeping track of the preferred medium of communication of their clients inspires confidence when it comes to dealing with finances. I go through the same motions every single year, and every single year Investec fails to email me. This is base level customer service: Contact your customer in their preferred medium of communication. If you cannot manage this, then you should not be in the service industry. I have actually resolved to take my business elsewhere, but low and behold, they've now acted on a whim without following my explicit written instructions regarding my finances. Still no email....