No notification of premium increase

I called to query why almost R300 extra was debited from my account without being notified only to be told it was an annual increase. I have requested for proof of a letter being sent to us to notify us of the increase, I haven't received anything as yet, I was also told that someone would contact me by yesterday afternoon, until now no one has called me back, I related all of my concerns when I called on the 07/07 but it seems to have fallen on deaf ears. its strange how we have been allocated a consultant but when we call she is NEVER available! I want to be reimbursed for the extra money that has been taken and I will be cancelling very soon. I am disappointed that after me calling and being promised to be called back no one bothered to contact me that I now have to vent my frustration on such a platform!