Art of Modern Dentistry Not Refunding the Advance. Chicago Illinois

 I went to the Dental clinic by March 2012, and did a normal dental scan and they found that i need to do Root canal surgery for two teeths and they gave me a quotation. First i paid a money in advance $241.60 and booked the date Apr 1st week for suregery. Due to my personal suitations i'm not able to go for the surgery and i cancelled it on last week of March 2012 - Before the surgery. Then i asked them to refund my money, they said they'll do at month end (not on March) only at April month end. I called them to confirm  my refund by last week of April. The Accountant said, they need to get the approval from management. I did not get the refund by April.

I called them again around 2 times in May 1st week, they said refund will be done by May 18th. And now they are saying they'll only do it by June. I don't know why.... I'm very much frustrated. Please advice me what should i do!!!