Charged twice for discontinuing service

After the loss of my spouse I needed to reduce costs.  I decided to bundle with AT&T which included a year contract with Direct TV.  Upon installation a 2 year agreement was placed under my nose to sign.  I spoke with several people in the company at that time telling them that was not what I had agreed upon with AT&T.  Direct TV was not willing to live up to that agreement and practically forced me to sign since this was after installation.  I continued to have billing problems for the span of 8 months.  A year later I have relocated and called to turn service off since it was no longer needed.  The representative told me that it would cost me $256.55 to settle up with them.  I paid this amount on 1/6/12.  I then received my credit card statement and Direct TV had charge my account for that exact amount on 1/10/12.  I called them requesting a refund and they tell me they will only refund approx. $218. because of a discount was given that I had not use since I disconnected service.  I DO NOT UNDERSTAND WHY I WAS CHARGED SHUT DOWN A SECOND TIME AND CAN NOT GET A FULL REFUND OF THAT SECOND PAYMENT.  $256.55 IS ALOT OF MONEY TO SOMEONE WHO IS A ONE INCOME HOUSEHOLD SELLING THEIR HOME TO REDUCE EXPENSES.  Yes, I am angry because this company has been difficult to deal with from the beginning and I found myself drowning in dissapointment.  Former address: 195 Suttles Road, Inman, SC 29349