Unfair practice

I have a life policy with discovery that I had to cancel and here are my reasons. I have had this policy since 2017 it started with a premium of R500 with with yearly increases was R847 in October. I received an anniversary letter telling me the premiums will increase by 13% as every year and I called to say I cannot afford the increases so I want my premium to remain as is. Mind you, my premium increases by 13% but my cover increases by 3% only every year. I was told that the only way my premium could remain R847 was if my cover amount was reduced from R700 000 + to R300 000. Even getting there was a mission. I was first told about a zero % increase which meant my premium would increase to over a thousand to keep the cover that I have now. I was forced to cancel my policy because there was no other acceptable offer I could take to retain it. I have lost all the premiums I paid till now. This is truly a travesty! Can you imagine paying almost R900 for a cover of R300 000! Discovery, wow!