Stamps.com Closed account but the monthly service charges keep adding up El Segundo California

 I cancelled my stamps.com account over thirteen months ago, one time even in writing through the mail. 

Since then I have somehow managed to still get billed for the past 12 months for services not rendered.  Since the credit card they were using has been cancelled due to them getting away with 3 months of payments before I caught on, they now email me my invoices.   They are now telling me that I owe them $143.91 for unpaid monthly charges for 9 months.

This is ridiculous and I am not the only who has been suffering through their fraudulent ways.