Canceling my membership!

I wouldn't recommend this medical aid!! I haven't been assisted with a pre-authorization that I have been waiting for from the 12th of July. When I call into the center, I'm just told to send emails, which don't get a response anyways. It shouldn't be such a tedious process to get authorization for a procedure. My treatment is being delayed! I'm not willing to call in anymore or send anymore emails, I just want to cancel my membership and move to another medical aid! Medsheild is useless!