Debit order issues

In April 2015 i took out a cellphone contract in addition to my internet contract. In May 2015 i changed banks, from Absa to FNB and closed my Absa account. I called to change my debit order details. They informed me that i need to make a manual payment for May and from June the debit order will change. My debit order as per contract goes off on the 30th of each month and is roughly R918 in total with my internet contract together.<br> <br> June debit order didnt go through. I called to ask what happened and they said they dont know and will follow up with me. I got no response. The middle of July, Telkom debits my account for R1500. I called yet again and they said they cant explain why and it will be rectified the next month. I had to reverse the R1500 and pay my usual monthly amount.<br> <br> July debit order did not go off. I called again and they are apparently still investigating. Yet again a few days ago Telkom debits R1500 off my account!!!<br> <br> You guys are in breach of contract! The contract states the date you must debit and the applicable amount! Why are you not debiting my account on the agreed date, and then double charge me later?<br> <br> I will be reversing the R1500 again. Sort this out!