Increase on monthly rent

On the 29th February 2016, I received a notice stating that the rent of the unit will be increasing, I immediately raised my unhappiness about this and received the below response: \Rental increases are determined by the popularity of the unit size you occupy and also by the Occupancy percentage of the facility you are renting from.<br> Currently Constantia Kloof is full and the 12 sqm unit you occupy is one of the most popular sizes.<br> The Terms and Conditions that you signed also stipulates that we are allowed to increase the rental rate from time to time. In this case it occurs round about every 6 months.\" I responded by informing them that I had various other issues before we rented the unit but did not make a scene about it as we have used their services before and was very impressed.<br> <br> On the 1st March 2016 - Storage debited my account with the increased amount. Which is highly ********* seeing that they were quick to refer me to their t &