Legal Shield Services Cancelled service, they continue to charge my card, promised refund x 2 still have not received Columbia, SC Nationwide

When I signed up for legal services membership, I was told that whatever I needed done would be covered with a monthly service fee.  The first time I tried to get a legal letter done, I was told that my membership didn't cover this and I would have to buy a higher membership to cover the service.  I then cancelled my membership according to the proper method of written (mailed) and faxed x 2.  Talked with them twice still no refund on the charged fee to my credit card.  They keep saying that they are working on it. Linda, North Augusta, SC