TELKOM NOT REFUNDING MONEY OWING TO ME

CASE NO ***TIN***; I first requested that my services be cancelled on the 27th of February 2020. I have a refund of over R4000 that is owed to me. I have phoned waited for over an hour for an operator to answer she gave me her e-mail address to send my queries to. I have sent her e-mails numerous times and she doesn't even reply.( (***) i have been into the local shop I have tried absolutely everything to get my refund. I have sent banking details etc into them. What can I do now to get this refund, I need this money to be reimbursed. Can someone please help me. I am at my wits end after all these months, HELP!!