I accepted a no risk trial membership in stamps.com which offered to give me $5.00 in stamps. I also purchased another $10.00 in stamps from them. When I tried to print the stamps, they were not centered on the forms and therefore could not be used. I called stamps.com to cancel my membership and get a refund. They sent forms for me to fill out in order to get a refund and told me that I had to keep my membership open until the refund was complete. It took many phone calls over a 2 month period before I finally got the refund. Then 4 months later they sent me a bill for $71.80 claiming that I had never canceled my membership. After I filed a complaint with the Postmaster General of the United States, they finally canceled my membership and stipped trying to charge me.