Unable to get customer support

On 2 November 2018. I received a SMS from MTN stating: Your MTN debit order payment was not successful. Please pay R663.06 with MyMTN app or via ABSA, FNB or Standard Bank. Select MTN and use A29***xx or 8326***xx as your payment reference.

I made the payment within minutes of receiving this sms.

Today, my account got suspended with the following message: Y'ello. We've had to suspend your ability to make outgoing calls due to non-payment of your MTN account. Please pay R651.56 with MYMTN app or via.. (rest is the same)

I cannot get through to an operator at the call center (tried 808 and 135). I cannot use the self service option. There is no option for me but to drive to a store. This makes the service bad in my view because I've followed all the instructions to the t.