Worst Customer Service Ever Experienced

Very Unhappy Loyal customer!!! Account number: *** Request: REQ*** I was due for an upgrade in April on the Helios billing system. When acting on the upgrade I get told MTN moved to a new billing system and I then get double billed and billed for an early upgrade. I have been dealing with the MTN store in ****arney mall and to date there has been no resolve since May even though multiple mails have been sent by the store. Please can a manager call me urgently tomorrow morning to get this resolved or I will stop the debit order and contract and take MTN to the CPA. Your service has been shocking and I have been a loyal customer for over 20 years. If this is how you treat your loyal customers then I will be happy moving across to Vodacom or the like. I expect this to be resolved by COB today (17/07/2020).