Investec still does not reply to emails

After botching a routine account closure from February, and a subsequent complaint, Investec has not contacted me via email since then at all.

Nor did they try to phone me. To reiterate: I prefer email communication, but after having to phone them to re-inform them of a complaint I filed via email in February concerning a botched account closure, they have not contacted me again. It's been two days later, and it's been three months since they were initially informed that they could not manage to close an account.