Terrible Customer servive!!! Train your people!!! Use technology to provive service in 2018!!!!!

It is a hairpulling exercise to change debit order details for my company cellphone. I have been sending letters on my letter head, company registration number and bank details but four months later I am still trying to get Vodacom to do that from their side. Their customer service agent Katlego Makwela who is obviously untrained says that the best way to get Vodacom to do their job is for me to walk into a store and make sure that it is done! So I am the supervisor now? Terrible!!!!