Poor customer care services from MTN

29 October 2018 i received a sms from MTN stating : 'Y'ello. This is a reminder to pay R---, to stay connected. If no payment is received, your services will be suspended in 2 days. ' 31 October 2018 : 'Y'ello. We've had to suspend your ability to make outgoing calls due to non-payment of your MTN account. On 02/11/2018 I settled my account - 30 days from date of statement as per original contract and i forwarded the proof of payment to customer care and collections. They responded with pin nr, ID, etc although the number occurs on the proof of payment. After I e-mailed the proof of payment for the 2nd time through to them on 02/11/2018, my services are still suspended and i received the following e-mail: Good day Jeanette, Thank you for emailing Customer Care. Please note as your payment method is cash you are required to make payment within 21 days of receiving your invoice, there is an outstanding amount of R 0.00 for invoice dated 2018-09-20, hence the account has been barred, your latest invoice amounted to R 0.00 for invoice dated 2018-10-20. Since when is cash customers treated differently than debit order customers? Today i received this sms from MTN : 'Y'ello. We've still not received payment on your MTN account. To avoid full suspension of your services and Legal action, please pay....' I e-mailed the proof of payment through for the 3rd time on 05/11/2018 - my services are still suspended.