debiting account without permission

I have two contracts with Intellicell, and my debits have been going every month with out any hassle. It been two years that I have been a customer of this company. However this month Intellicell decided to trace my account from the 15th of March for money so that they can debit my account. My agreed debit date with Intellicell is 24th of each month, and if said date fall on a weekend or public holiday the debit goes through the day before or they starts to trace from the day before. I am so angry at the fact that they decided without any notification or warning to trace my account 5 days prior to the agreed upon debit date. I online chatted to the consultant Mogamat, sent him a snippet of the EDO Cellection attempt(trace) who told me its not them tracing my account because their company name is not showing on the description. At this time I didn't have any money in my account, a few minutes later a received a R500 in my bank account and the moment that money was available Intellicell debited the installment amount which they've been tracing from my account. I the sent the screenshot to the same consultant who told me its not reflecting on their side that the debit went through. I requested they escalate this matter so i can have my money returned, he told me it take s 24 hours. I then phoned intellicell myself and was directed from one consultant to another and then I ended up on hold but not properly on hole...like the phone was just placed on the desk because I could hear people talking and walking about until they put the phone down in my ear. seconds later I received a call from Nicole, i explained the situation to her and she tells me they received word that because of the school holidays Educators are getting paid earlier this is the reason why the debits went off early...my response to her was I work for an education company as an administrator im not an educator. She said she would try resolve it and call me back the next day, but before I can ask her what her name was she hung up. I then immediately called back and asked to speak to a manager coz my issue now isn't just that they debited my money before the time, my issue is that they did it without my consent, without any notification. Nicole them escalated the call to her manager who told me the same bull**** Nicole did. Since when do companies just trace your account 5 days before the debit date, since when do companies debit money from your account without your permission. I was with this company last year and this didn't happen at all. what gives a company who you've been loyal to for two years the right to just debit your account or even trace your account whenever they feel its necessary to do so? This is a ********** act on their part and I am disgusted at their service. No email, no sms, no notification of any sort to let you know they will be tracing or debiting your account 5 days before the agreed upon debit date. no customer service qualities at all that they've even inconvenienced you in any way.