DirectTV Took money after telling me they would prorate my bill as I moved after 18 years with Direct TV El Segundo Nationwide

After nearly 20 years of being a loyal customer at same address I had to move for health issues, they said on last bill they would prorate as I did not owe a full month, they did this Feb 7th well in March I got a visa card with Direct TV on it, I have called many times as all we can get here is cable,I live in a senior citizen building so no dish allowed. they refuse to give me my 34.00, I have no use for the card and they should have just took what I owed them, every company except Duke energy took another month from me... no such thing as honest big business any longer that I know of. Please help me recover my money back to my bank where they took it from..