They are not refunding my money back

I have taken the 6 months package from them but due to some unavoidable reason i need to leave in 5 months so i asked them to refund my money and they simply refused to that and then i asked them to increase my package so that this amount can be adjusted they told me that they will get to me soon and from last 1 and half month i am calling them and raising tickets for the status and they are simply telling me that concerned department will get back to me soon .Any reason for this pathetic reason from them.