Discovery Insure -Increases Excess without Correctly Informing Clients

I am insured with the company for about 2 years. I last had contact with anyone from the company, on or about June 2019. I lodged a claim for a gas geyser that was ****** of my property. I spoke to Jade from claims who assisted me with capturing my claim and advised that my excess had increased from (plus / minus) R700.00 to R6000.00. Jade advised that this was done on my policy anniversary date. I requested to know how was this communicated to me and I was told, by email (This mail, I do not know about). I believe that anything regarding finance should be verbally corresponded to the client. I then spoke to Musa (Jades Manager) who could not assist and advised that someone senior from Underwriting will contact me . To date and time no one has called.