Shark Navigator VAC NV355 review: Leaves dirt & warranty

I bought a shark vacuum jan 2013 it has plenty of suction like they say. Now in dec 2014 the vacuum leaves
Spots of dirt when you bring the vacuum back to go forward again leaving spots all over the carpet. The warranty is for 5 yrs!
You cannot buy a belt or a brush for this vacuum it is all sealed in where you can't get to it, you must buy a new turbo brush which i'm told cost about $60.00 that's not including shipping. I called shark co. I had 2 options - send back at $20.00 each way takes 2 weeks to repair or buy a new one around $100. If I had known you could not buy a belt or brush
I would not have bought vacuum (nv355) warranty is a joke to bad a person cant see the warranty before they buy. I went thru all the test with shark employee alex until we were cut off called back and talked to taylor she gave me the 2 options
Both were (females). I told taylor of my dislike of their policies.