I think there is problems with every canvassing company, I have spoke to most, some I have used, some I will not, and some I would never use, or use again.
the main problem I have found is:
1, they advertise and when you ask them to do it they cant, not yet to busy.
2, they work for you and dont get what you want.
3, you email and get a reply a week or so later
4, they do work for you and get one-off cleans (that you pay more for)
5, once they have done work they dont call you or let you know whats going on
6, they give it the big we can do this can do that , then not deliver.
I know one of these companies have reformed sacked the problems and are going forward, other still do the same and dont listen, in a few years some of these will not be around and I would lay money on it.
RANT OVER