Debit order debited payments not updated on their side and got a double payment statement to pay in jan

Bad customer service I have 2 contact phones that I took in Nov 2018, the first debit was going to be debited on the 25th which it was debited on the 29th of December 18, because the 25rh was a public holiday, however in January 2019 on the 2nd I received an sms notification stating that I haven't paid and my services on the phones will be suspended I went to the Westgate branch on the 3rd to query this, the call center was called again, I spoke to the consultant who said the payment reflects on one system and has not been located to my account in order for the payment to be up to date, she advised that she has made a request for the payment to be updated on the system and it will take up to 24hrs. She said she has no red and that I can use her name, date and the time of the call and use it as a ref number. How professional is that. It's been 7 days now no payment had been updated, I instead received a statement on the 5th Jan 19, with a double payment of the last month's which I paid and of this month of end of January, this morning the 11th I received the sms, stating that my account has been suspended. This causes a bad credit record under my name because Telkom's incompetence abs it's not acceptable. They did the same thing on the other contract before the upgrade, I thought their service will improve, I want to cancel this contract as they are not adhering to it. I had previous 2 yrs experience of bad service, giving it a 2nd chance when upgrading was the bad choice, I can't be calling and going to the branch querying one thing and no improvement from their side.