Telkom - Locked Account

I cancelled my old contract and took out a new one with a trade-in and I was told I have to pay an amount which I was fine with (I knew it would be on my next invoice). Today my account got locked because the limit was exceeded because of this invoice and there is no way for me to call anyone to get it unlocked. I was not even told that this would happened. Telkom's self service on whatsapp is pathetic. There is no help line if you can't get helped there.