Misinformed and now paying more!!

I originally took out the car insurance because their premium was very good, I called in to change my start date to match the date my previous insurer ends cover, not knowing that it would effect my premium, over R100 more, which doesn't make sense to me since all my risk info is literally the same, I was not told at any point in time that changing a date would effect my premium as of course I do not work in insurance and no one at Miway had told me this to start with. I was extremely angry and was on the verge of cancelling because now I would be paying more for insurance that I was at my previous company which defeats the purpose of changing insurers, the lady I was speaking to was of no help and simply told me she can transfer me to cancellations as though I am of no worth to the company and keeping my business is not important, not even trying to retain me when mind you my life cover is with them as well. I was at my wits end until I spoke to the manager Tabanchu who I must say handled this situation very well, well mannered, understanding, calmed me down very much and did not treat me as invaluable. He unfortunately could not get my premium back to what it was but got it down by R50 which is much better than nothing and I do appreciate his effort, ultimately I would like to compliment him and his wonderful customer service!! But the lady I initially spoke to needs some training on how to handle a customer efficiently.