I took out this cancer policy in case I will need it in the future, I explained that I can only afford the premuim I'm currently on, but If they increase the premuim I will have to cancel

I took out this cancer policy in case I will need it in the future, I explained that I can only afford the premuim I'm currently on, but If they increase the premuim I will have to cancel. Until recently they again inform me about an increase and they are so persistent that I agreed on a lower increase, but it's putting me in a predicament on my finances. I actually feel very annoyed.