Kirby (quality cleaning systems Kirby vaccum cleaner Ripoff Murrieta , California

A person Knoked(girl) my door offering to clean any room and get estimate for entire house do I agreed an hr later two men show up with Kirby systems to try their product and clean. My stair so I agreed after hrs of negotiation end up buying the kirby for $990, $240 down and get Creadit the rest and I have three business day to cancel the third day was on Saturday do I called to cancel the told me Saturday is business day first agreed than later on said no unless subtract $100 from down payment that was 8/4/2012 and I will get my $140 in $10 days today is 8/18/2012 and no sign of my down payment the manager show up picked the vaccum unused and untouched. At time of purchase they told my I have 45 days and no question ask not only I was ripoff but Knocked the door as carpet cleaner is very cheap and no sign of my down payment
Please help to recover my money
Is Saturday is business day in ca please advise
I thought Monday thru Friday are business days
What do you thinK?