I purchased a Pro Heat

Question

I purchased a Pro Heat self propelled Bissell rug cleaner model 7950 from Target wherehouse on 4-26-06. I used it once and all was fine. The next time that I went to use it the smart mix for the cleaning formula would not dispense formula.I called Bissell consumer services and was told to take it to Starks Vaccumn in Sherwood, Or. That was on 10-30-06 They said that it was working so I tried it again and not a drop of formula was or has been used since.I took it back 2-13-07 and the replaced the smart mix dial still didn't work. They said it was working but not so.I have used it a couple of times but only plain hot water. I am at a standstill to what to do. It should work more than one cleaning. Please inform me on what to do.