Weird way to retain client?

Not going to rate bad or good, just average as I haven't had awful service from MiWay in the past but neither does the following strike me as good? I got a competitive quote from another insurer which essentially gives me about R300 off my current premium at MiWay. Phoned MiWay to revise my current premium and compete with the quote I received as I don't really want to move away. They told me that my annual premium increase is going to happen in December and that the revised premium won't do me any good as it's only going to be for one month after which I will pay an increased premium again and I should rather try to revise the premium next month. Fine, I understand that but that's not a good way to retain me as a client as I can sign up tomorrow which means decreased premium of R300 from next month for the next year at the competitor while with the increased premium at MiWay in December I might be paying R200 more? = R500 decreased premium at the competitor until I revise (and the revision probably won't be R500 ...)? Doesn't quite make sense to argue like that. Will think about it as I might just move after this disastrous quote.