radio shack refused return with valid receipt -manager said serial numbers did not match on item and box-Scam. Just don't shop here marietta georgia

Bought 300 dollar security system as gift.   Recipient could not use it   Refund policy on receipt said all I need was a valid receipt and item in new condidtion so I tried to return it.  Manager immediately pulled item out of box and said item serial numbers did not match box serial numbers, as though he uses this reason for refund refusal a lot.   I was offered a Radio Shack gift card but did not want it. Manager flatly refused a refund back to my credit card.   The refund policy on the receipt should read " serial numbers of item in box must match box"  for this to be fair.