I posted last week about our "free" 6 week trial with the MM 630. After a week my daughter wanted to send it back because the sensor was so inaccurate. We have been trying to return the pump for 2 weeks now. We keep getting the run around. Today we received notice from our insurance company that MM billed the day the pump shipped. Our insurance has already paid for the pump so now we are unable to move forward on the T-slim. Now we know why MM is dragging their feet about taking it back. I was told they needed my insurance info to verify my coverage. I was told they would not bill insurance until after the trial. I have spoken to a few MM reps on the phone today. The first thing they each said was that I wasn't supposed to know that my insurance was already billed. Sounds like they are trying to run a scam to me. We have already burned up three weeks. The rep called today to say that if we liked the pump we should keep it and not use the sensor. I am not sure what part of NO is not clear. I think they are trying to run out the 6 weeks so we will be stuck with it.