Vodacom - zero service!

I have been contacting Vodacom since January 28 this year to ask them to change their debit order from my business account to my personal account. My company had to close down because of Covid and I would like to close that bank account for which I am still paying monthly charges due to the Vodacom debit order! I have sent them all required supporting documentation and they are not answering my e-mails sent to both customer service and BusinessRecoveries. I visited my Vodacom shop here in Knysna and they told me that there was nothing they could do from there. This is unacceptable.