Quitting Medical Mutual's Superwell program?

Does anyone know if Medical Mutual can deny you your testing and pump supplies if you quit their Superwell program? My patience with the long, invasive phone calls is wearing thin, and I don't think I have gotten anything out of this except a growing annoyance with my Type I diabetes (where I used to have a pretty good attitude, really.)

The only reason I have tolerated these nonsensical conversations with people who have very limited knowledge about diabetes is fear that I will lose my benefit of testing and pump supplies delivered (mostly) free of charge. They make it sound like if you quit, you will not receive benefits any longer. I'm not sure that's even legal.

Has anyone successfully rid themselves of this nuisance without losing this benefit?