Investec still has not closed my accounts from more than 2 years ago

Investec apparently still has an 'inactive account' for me despite me phoning them, them emailing me written confirmation that all my accounts have been closed, and years going by without me receiving any communication from them. They've botched this before (see other complaints on here). More than once. They've sent confirmation more than once that the accounts were closed. Now it appears that no, they have not been closed, they're merely inactive more than two years later.

Word to the wise: Do not deal with Investec. Once you do, you can never leave.