Instalment reviewed without my consent

I was a member on vitality and a month ago I no longer had vitality and also my 12 month contract was ending . I paid in 1050 thinking I am paying to cover previous month and current month only to be told it is my new instalment when I called in today. I asked Nontshululo who picked up the call when I called in today realising they had deducted another 1050 , I asked this lady her name and she’s said she is not allowed to say her surname I can quote that the call was at 11:18 when I make an enquiry. She asked me why I paid 1050 and I said because I had arrears and the current month so I asked her , I never recieved communication that my contract is now conincidentaly the same amount that I paid in and she said I must go read my contract it is automatic that your contract will be renewed from month to month without your consent because it’s in your contract and she said she is sure that what she is saying is correct. So my question is , the amount changed by a whole R650 and virgin active did not communicate that they just changed mandate on my bank debit and continued with deductions no communication whatsoever. And this lady was even rude in her tone saying hi read your contract . I’m appalled with the manner this query has been handled and the changes of amount without being notified nor asked if I want to continue

I am not happy at all with their manner of transact