Unbelievable difficulty in closing my cheque account during pandemic - unsuccessful to date

I have had the worst experience with ABSA. I have had a cheque account with them since 2000. On 1st April 2020 I wrote an email to them, in order to close my account. The balance on my account was nil. Due to the pandemic, I was unable to physically go to a branch to close the account. I have subsequently sent ABSA many emails, and contacted customer support, to no avail. They have handed my account over to lawyers. According to them I owe them R877.68 - this balance is for BANK CHARGES from 1st April 2020. I have not been transacting on this account as my instruction was to close it. The lawyers are calling me on a daily basis. I've asked them for an email address in order to submit all the documentation to them, but they refuse to provide me with one, and say they cannot stop calling me. ABSA needs to notify them that I do not owe them any money. Every time I send the email with all supporting documentation to ABSA I receive the following message. Dear Brenda Steinberg Please expect a delay in response. You are welcome to contact our call centre for all critical queries that require immediate assistance on ***. Alternatively, please expect a response in the next 14 working days. Due to the Covid-19 pandemic that is currently gripping our nation, Absa bank fully recognizes the consequential financial strain experienced by all our valued customers. We are also putting precautionary measures in place to protect our staff, which includes reducing in house capacity to minimize potential exposure to the virus. Whilst we are doing everything within our means to ensure we meet all expectations, delays in non-critical services provided by the bank can be expected and will only be operational again after the lock down. For all refund requests please contact our call centre directly to assist as e-mails will not be attended to at this point in time due to high inflows received and to avoid any delays. Please contact our call centre for all critical queries that require immediate assistance. Centre on ***; operating weekdays between 08:00 and 16:00. We apologize for any inconvenience caused and we appreciate your continued support and co-operation during this time. Absa Bank wishes you as well as your family good health and safety. Your case reference for this email is C-***8 Kind regards Absa Everyday Banking Enquiries ***I have done all I can...horrible horrible experience, could anyone assist!!!