Beverly Diamonds Lied about return policy. Had me sign a receipt that turned out to be a return agreement. Product I purchased was in stock, but they claimed it was "custom made". California

Return policy claims that in stock rings can be returned within 30 days. My ring was in stock, but they claim it was custom made and can't be returned
I was shopping for an engagement ring that could be immediately shipped to my home address. The ring I found was in stock in the correct size. Immediately after paying for my order, the ring was shipped.

I contacted Beverly Diamonds two days ago on the phone in order to return my purchase. At first, Beverly Diamonds told me it would be possible to return, but they would have to call me back with a shipping quote. Later that day, they emailed me claiming I am not eligible for a refund. Upon purchase of the ring, they had me sign a receipt which claims my ring was custom made to a size 6. However, my ring was not custom made. The ring was in stock, which is why it shipped out immediately after purchase. They never mentioned this to me before I bought the ring, or before I signed a receipt.

Their website's return policy claims "All diamond eternity rings, bands and customized rings are non-refundable".

My ring was not custom made. If it was, my order would not have shipped out on the same it was purchased. It seems as though that Beverly Diamonds does not stand behind their own return policies, which is apparent from all complaints on Better Business Bureau's website regarding "refunds". There have been many complaints regarding customer service, returns and exchanges.