I had this happen, call medtrontic (if you have the mini med), they were very helpful to me!! my sure-T wasn't delivering insulin, yet I didn't get a 'no delivery' alarm...it appears to have been air bubble in the tube??? not sure, i saw droplets before insertion, but a day later, when I took it out to test it, got no drops, no wonder why my glucose was rising...by the time I called medtronic I was distraught, crying and exhausted from dealing with this for hours and hours, no sleep the night before etc., they were kind, understanding and helpful. I hope you get things straightened around soon, there is nothing more frustrating!!