Explainable Rate Increase

On the 28th of November collected a vehicle from the Sandton Branch and a rate of R637.00 was given to me and I paid for 3 days with deposit included to my surprise when I want to extend my rental Candice my consultant advised that the rate has increased to R981.00 not only that but now I am required to pay that R981.00 effective from the 28th of November 2019 as my whole rate has changed.To say disappointing and upsetting is an understatement because in my entire existence and dealing with this service provider for more than a year this has never happened where a customer is asked to pay to do a back date payment when I initially paid on the day of collection and a rate that I was given by the service provider and now I must be financially prejudice by their system explainable sudden increase that has nothing to do with the days that I have already paid for. I demand that they rectify this because there is no way that I will pay for the days that I have already paid for and R637.00 was not a rate that I thumb sucked but it was a rate that was provided to me and certainly was happy with.Transparency is vital where finance is concern ...I will not allow Europ Car to treat me as if I have never dealt with them before and the fact that I have dealt with them for a year definitely should tell you them that I am one loyal customer and at this point or rate that they are treating their customers they will loose us very fast like the likes of Hertz.I demand that this issue get resolved ASAP.