How do you figure that out ?
I have done this trick a number of times in the past ,it was actually Laya that first told me about it
I'm just saying that if you are paying 1000, and the renewal is 1200, then you might cancel and renew 1 month early to pay only 1000.
Next year (1 month earlier than normal), your renewal might have gone from 1200 to 1400.... but to you that is from 1000 to 1400.
So unless you cancel can renew early again, you are going to get hit 'twice' in one go.