I'm my case it was agreed per phone conversation they would send me a check as I had cancelled the cc account during the time of purchase and returning the wrong product. Due to this I had to take a 25% restocking hit. I accepted this as I had waited a while before trying to return the order.

Once West coast differentials received the returned goods they claimed they had given me credit to my card. I contacted the credit card company and they knew nothing of a credit from West Coast Diffs. Would not do a charge back as I no longer had an account.
Later West Coast claimed the returned gear sets were rusted and no good to them. The box had never been opened and had been in my house during my possession.
If I had been within a three hr drive you would have been seeing me on the news.

Sorry for the hi-jack. I hope your problem is resolved with PP.
I trust Phil.