Billing me for a service I have cancelled 3 months

Elite Mobile is de*****ing my bank account, I have spoke to more than one person to cancel all the extras on the package that I have taken and really after three months it's still not cancel. they took my money from my account but can not refunds me the same day so why do they take my money. I will have to go to Cell C to buy out this package thank you for that I can not have dealings with companies that's de*****ing my bank account. If you take money and it does not belong to you what does that means. This is now costing me bank charges and interest on my balance in my account. DON'T EVER DEAL WITH THIS COMPANY YOU WILL BE SORRY.