No debit order in December but double debit in Jan

I received an email end November 2015, stating that the December debit order would be taken on 19.12.15. However, the credit reflects on my statement as 24.12.15. The payment was then reversed & debited to my account again on 11.01.2016. I queried this with the Clearwater branch on Friday 15.01.16 & the staff member called the accounts department. He told me not to worry, the account is incorrect & it doesn't affect me. My response was, of course it affects me, there's a debit order of R957 about to come off my bank account! Again, he reassured me that there was nothing to worry about. <br> My contract expired 31.01.2016 & when I tried to upgrade, I was told they ONLY stock Android devices, no iOS/Apple. So I decided to cancel the contract & move to a service provider that will offer Apple/iOS devices. The cancellation was done with the call centre (Leepile) on 31st January. I asked to be transferred to the accounts department to sort out the incorrect debit & he advised me there isn't one! There is NO MEANS for the account holder to contact the accounts department! I can't even access voice mail & calls drop constantly.