Now, Im Pissed!!!!

OK, I am now pissed. Not happy. There are 3 phases to my exercise program with my personal trainer. Foundation, Build and then BURN. Like the name says, the Burn phase is where you burn the most fat. So right now I am in the foundation phase, STILL. I should have moved on to the build for a couple weeks now. Why haven't I move there yet, you wonder??? Well I have a bad knee that prevents me from doing lunges. Even though I am seeing a Physiotherapist, the knee is not getting much better. lunges are according to my trainer a key movement to the program. I do some one day then the pain comes back and then I'm a couple weeks behind. So I was telling my trainer today how frustrated I am. I don't understand why we are not at least starting the Build phase for the upper body. To me it is her job to find other type of exercise that will achieve similar results. What if I never get to do proper lunges??? Am I never going to get to the next phase? The reason I paid so much money is not only to get help doing exercise, get healthier, bla bla bla but to LOSE Weight!!!!! So now I'm back at icing my knee tonight. I pushed a bit more tonight to do these stupid lunges to the detriment of my knee . I hate not succeeding! I'm not sure which approach to take??? This is also ruining my relationship with my personal trainer which to me is very important to make this program successful. It will be otherwise to easy to cancel my appointments with her. I'm not sure what to think!!!