Telkom debit orders incorrect

So, I have 2 telkom accounts. With my first one my debit orders were going off to early in the month and then they bounced and then I get charged an additional fee for bouncing debit orders so I changed it and got banking details and rather paid EFT every month which was going well until I got the new contract. I made it very clear to them that the debit order needs to go off after the 1st of every month which they confirmed with me too.on March 25th they debited my account. Luckily I had money in. When I phoned to ask why the guy argued with me saying it went off on the 4th of April which is not true. He also said my March payment was not paid which I did pay and sent him my bank statement to prove it. I was told that at. The end of April I have to pay another R372 because of debit orders bouncing which is not my fault because I stopeed all debit orders to them. After emailing the guy 3 times I have not had any response. Please get this sorted out for me.