FAILURE TO REFUND MY MONEY

I paid my account in full on the 2nd of April 2015, in actual fact over paid my account because I didnt request a settlement amount which then left me with a credit balance of R722.18. I went into the store (N1 CITY) on 8 April 2015 and requested them to close the account and refund the money. On the 16th of April 2015, I received a statement where I was charged interest of R292.41 on the amount that was already paid and my Credit was reduced to R430.18. I then called their RCS Dept. and explained the whole situation, I was told that they would get a Team Leader to call me back and sort out my query, however, nobody got back to me. I then called them this morning (17 April 2015) and spoke to a consultant andshe explained that she will escelate the query to a Team Leader, however, all the team leaders were in a meeting. On the 17th of April 2015, about 3:30, nobody has contacted me as yet. When I spoke to the same consultant, she said that she advised me that there are no team leaders on the premises and the refund might only be paid by the 22nd of April. However, she did not confirm that the full amount will be paid. Still waiting on response from a team leader or manager.