Impossible to close business bank account from abroad

Hello,

I tried to close my business bank account from abroad since I emigrated last year. So I emailed them with my request. They responded by requesting that I email certified copies of the closure request letter to them, along with certified copies of proof of ID. I told them I am not incurring those expenses (which is a lot more expensive abroad than in SA) and just want the account closed. I asked them If they could not just call me and do it over the phone (as what was done the week before to close my personal credit card) and their response was "sorry, your number abroad is not registered on the system". The account balance was zero and is going into a negative due to bank charges and now I get letters of demand because of the negative balance.