invicta watches paid $480.00 for watch 5 weeks later the watch is $319.00 after 30 days they won't adjust price BIG SCAM prairie Minnesota

Bought an invicta watch on channel 129 evine, for the price of $480.00.  the sellers boasted "what a great price".  so on a 6 month payment plan, I purchased the watch with my credit card. 5 weeks later,  the show was selling the same watch for $319.00, which is a difference of $160.00.  Unbelievable.  called their customer service, they stated that after 30 days, they can't adjust the price.  SCAM.  what did they do wait a week after the 30 days was up to put it back on tv again.  how many people did they do this to?  These people can't be trusted.  will never buy another watch from them.