As you've probably gathered, you should change instructors. But if you've paid up front and you're worried about making waves, then do it tactfully. Have a word with the CFI, and say straight out that you're not blaming anyone. Say that you feel it's a personality clash, and you're sure it's no-one's fault, but you're just not happy and you'd like to change. No-one can get too upset about that.
If that doesn't work, have a word with the school owner/manager about getting a refund and changing schools. This is usually possible; in fact I've never heard of it being refused.
I had problems with instructors for both my PPL(A) and PPL(H). I sorted them out and changed instructors, but I'm still discovering some of the repercussions, in terms of things I didn't learn, problems that weren't picked up on, and so on. They're little things, and will get sorted out. But in both cases, I wish I'd changed instructors when I first had an inkling that it would be a good idea, not when it became obvious that I absolutely HAD to. Maybe at least others can learn from my mistakes.