Mobile account

I received a sms at 7.25pm on Thursday 12th Nov telling me 'Your account is over due which is due to non-payment or a payment being declined by the bank. Please kindly make payment within 48hours to prevent the interruption of your service' So Friday morning I walk into our local branch to try and sort this out, I took copy of bank statement with proof that my debit order went out on 15th Oct, so they phoned the call centre and handed me the phone to do the necessary explanations. I was informed that the payment the took from my account on the 9th Nov was returned and they tried again on the 11th Nov and it wasn't accepted. I enquired why they would try on both of those dates when my debit was only meant to go through on the 15th! While I was waiting for an explanation I checked my account and NOT ONCE did they try to take any funds from my account and nor was any payment returned! THIS IS THE 3RD TIME THIS YEAR THIS HAS HAPPENED. IF I GET CUT OFF I WILL LOOK INTO TAKING LEGAL ACTION, as far as I am concerned this is in breach of the signed contract. They ARE NOT SUPPLING ANY SERVICE. I WILL NEVER SIGN AGAIN WITH TELKOM OR RECOMMEND ANYONE TO USE THEM. Lots of promises no action!!!