Debit Orders Concerns

I called Momentum Health on the 4th of August 2017 to terminate my Medical Aid with them. When it comes to money, its quite a sensitive topic and i have called them and ask three different types of agents to confirm with me if any money will be debited from my account, and all three of them have confirmed that July 2017 was my final payment. Today, the 23 Aug 2017, i called to make 100% sure that no money will be debited, this agent, Donovan told me that i will have to pay this months repayment even though i have been given notice. My problem is, i have 3 people who gave me their word that no debits will take place this month and 1 who told me today that a debit will come off this month. Worse case is, i am not getting any money back and have been paying for a stupid hospital plan, my family and i dont benefit from. Not once have i ever used it to go to hospital. Someone need to tell me what to believe now, will i be debited or not, or should i block debit orders to avoid things like this to happen. And why dont i get money back if i never even claimed or used it. Its a total *******!