Bad service from Absa insurance client services

I have received an sms 2 days before my debit order went through on my account for my insurance monthly premium. On the sms I notice that my monthly premium has increase by 11% without being notified. I decided to call them to seek clarity about the changes on my policy, the lady who was assisting me was very root, she does not want to listen to me ,according to her I must accept the increase and I was not supposed to say anything because they have the right to increase the premium, I said to her as a client I need to be notified a month in advance because in the last 4 years the usually notify me in advance.