Since they are not answering your questions you shouldn't buy from them.
Find another source that will talk about your concerns and needs as you found a bad one.
I have a walkway that gets dirty very often and cleaning it has ever been difficult. Which vacuum cleaner to buy that are used to clean tiles(ceramic). I came to know about vacuum products from Vac-Master that sells vacuum cleaners of several types which I am bit confused on which one to buy. Can you please help me get the right one?