Horrible service from Telkom

Telkom is a ****, I changed my banking details in April and informed all my creditors and when I have to change with them I have been transferred from one department to another with no help. I ended up paying via EFT since May for 3 months I have been paying via EFT and on the 23rd July they suspended my account that I owe R 759, My monthly payment is R 159. They claims that the R759 is for the debit order returns, which I struggled to get help on changing them. Their emails and sms'es are system automated and I couldn't reply to inform them I have changed the banking details. They mention that when I pay via EFT I was supposed to pay 10 days prior the debit order , but that information was never communicated with me. I am escalating the query to ICASA because I am not paying R 759 of something that was out of my control. I paid my account in full and I do not owe them anyhting but my phone is now suspended