Change in installment.

Towards the end of last year, Discovery quoted me almost R1000 less than Outsurance per month. I called Outsurance to cancel and due to being a customer for over 15 years, Outsurance offered to requote me, which I accepted. This was still highter than Discovery, but roughly R400 less than my existing premiums. I was charged this new premium for exactly one month. The next month my premium went up highter than the original amount! So now, I am paying more than I was ever before. I called them. Got some bs excuse and my premium is not changing back to what I was quoted when I tried to cancel. How is this even possible????